Stereo Headset for Phone Calls

Experience immersive audio and crystal-clear calls with these Bluetooth earbuds. Featuring built-in magnets, these wireless earbuds stick together when not in use to prevent accidental misplacement. An ergonomic in-ear design ensures a comfortable fit, while on-ear controls let you change songs and take calls without using your phone. These Tzumi Electronics SoundMates Bluetooth earbuds have powerful speakers that improve your listening experience with rich, detailed audio..Truly wireless and compact, these headphones are the perfect earbuds for everyday convenience on the road, at the gym, during a commute, at work, and just about anywhere else.True wireless earbuds – no more tangled cables.The headphones feature easy-pairing Bluetooth 4.2 calling capabilities, a built-in microphone, and high-resolution stereo sound.Wireless headphones are ergonomic with an in-ear design and built for easy handling during a workout: users can control their calls and play/pause with the touch of a single button.Built-in lithium polymer battery.Rechargeable headphones come with a protective case which carries an extra 500mAh capacity of power, so you can instantly charge while out and about.The headphones provide up to three hours of crisp, clear stereo sound.Conveniently magnetized: these earbuds deliver big sound in a tiny package and have magnetic power to enforce that the pair remains stuck together, unlike other Bluetooth buds that can easily get separated and lost.1-year manufacturer limited warranty.Safety Data Sheet.Listen to music in the office and at the gym with these Tzumi SoundMates wireless Bluetooth earbuds.

The AC-5008 is a quality stereo headset built from the ground up, perfect for today's demanding classrooms. Utilizes a USB connector, compatible with any USB equipped device..This wired phone headset is perfect for everyday use with compatible electronic devices.Blue/black on-ear design with high-comfort ear pads.USB phone headset can be used across many different devices without hassle.Ambidextrous boom for left/right side use.Adjustable headband.Classroom tested durable design.Braided TuffCord™.⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Communicate without distraction with the Evolve2 40 SE Stereo Wired On-Ear Headset from Jabra. In modern-day offices with open floor plans and busy work environments, noise and concentration are valuable commodities. The Evolve2 40 SE headset is designed to block out noise with isolating oval memory foam ear cushions and an angled earcup design to maximize passive noise isolation. To keep distractions at bay, the integrated red busy light can be seen from any direction and is automatically activated when on a call or in a meeting. It can also be manually activated when needed via earcup controls..Designed for professional use with phones and computers, ideal for calls, meetings, and collaboration platforms..Compatible with computers, desk phones, and mobile devices..Sleek black finish with an over-the-ear headset design for immersive audio and all-day comfort..Comes with a durable USB-C cable approximately 1.5 meters long for reliable wired connectivity..Features soft memory foam ear cushions for superior comfort and passive noise isolation..Equipped with a retractable boom microphone featuring noise cancellation and 3-microphone call technology for crystal-clear voice transmission..Offers 32 ohms impedance for efficient performance with standard devices like PCs and smartphones..Powered via USB connection, eliminating the need for batteries or external power adapters..Microsoft Teams certified for seamless integration and optimized performance in professional collaboration environments..Backed by a 2-year limited warranty for added peace of mind and product assurance.

The Cisco Headset 500 Series delivers surprisingly vibrant sound for open workspaces. Users can stay focused in noisy environments with rich sound, exceptional comfort, and proven reliability. The 500 Series offers a lightweight form factor that is comfortable to wear, even for an entire workday. It's designed for workers who spend a lot of time wearing headsets for voice communications and listening to music..This wireless phone headset is perfect for everyday use with compatible electronic devices.Black on-ear design with high-comfort ear pads.DECT frequency band transmits your voice and gives transcendent voice and sound quality.Phone headset captures audio cleanly at frequencies of 150Hz-6800Hz.Impedance: #10 Ohms.Rechargeable battery provides up to 10 hours of working time

Stay focused with ANC that reduces background noise, helps you concentrate in busy open offices and boosts productivity on-the- go. Ensure clear business calls with a solution optimized for UC and switch easily between devices as you multitask. Enjoy over-the-ear design and ergonomic ear pads that add noise dampening and long-lasting comfort at work or on your commute. Empower your performance with professional quality and sleek, comfortable design in black or white to suit your style..This wireless phone headset is perfect for everyday use with compatible electronic devices.Black on-ear design with high-comfort ear pads.Bluetooth for wireless use.Phone headset captures audio cleanly at frequencies of 80Hz-8000Hz.Impedance: #46 Ohms.Rechargeable battery provides up to 46 hours of working time.2-year manufacturer limited warranty

The Poly Blackwire 3325 provides a quality audio experience in a headset that's built for enterprise needs. Built for style with a sleek design that focuses on comfort and reliability. Poly signature audio quality so you know you will sound great. And intuitive and simple features so every user can connect to their preferred device simply and easily..Manage calls on your preferred device with the comfort and durability of a corded headset.On-ear stereo headset, comes in black.Cable length: 3.85' (inline module to headset); 2.95' (USB to inline module); 7.05' (total USB to headset).Supports long-wearing comfort with a plush, padded headband, and pillow-soft ear cushions.Features 180-degree pivoting speakers and a flexible microphone boom.Enhanced connectivity for your devices: USB Type-C cord with tethered USB-A adapter for PC and 3.5 mm for mobile or tablet connectivity.Microphone sensitivity: -38 dBV/Pa; microphone frequency: 100 Hz to 10 kHz.Impedance: 32 ohms.UC certified.Dynamic EQ optimizes the quality of your voice on calls, and automatically adjusts the EQ settings when you want high-quality sound for listening to music or for multimedia playback.Hi-fi stereo wearing style for those who want a richer, more immersive experience.Use the intuitive inline controls to answer/end calls, control volume, and mute to simplify call management.Completely plug-n-play with USB devices, so users can take calls in the office or on the go.Crisp audio paired with all-day comfort lets you handle any call with ease.IT manager's dream, this headset was created for communication and is optimized and certified to work with top virtual meeting providers.2-year manufacturer limited warranty

Communicate without distraction or wires with the Evolve2 65 Stereo Wireless On-Ear Headset from Jabra. Utilizing wireless Bluetooth technology and an included USB Type-C adapter, you can take important calls at your desk or walking the halls. To stay focused, Jabra incorporates isolating oval memory foam ear cushions and an angled earcup design to maximize passive noise isolation. A call can come at any time, which is why Jabra integrated a powerful battery that gives you up to 37 hours of power..Designed as a professional on-ear headset ideal for office use and remote work..Compatible with PCs, laptops, tablets, and smartphones..Offers wireless connectivity with a range of up to 98 feet for flexible, untethered movement..Sleek black finish with an on-ear headset design for professional style and comfortable wear..Equipped with memory foam ear cushions for superior comfort and enhanced passive noise isolation..Features advanced 3-microphone call technology and passive noise cancellation for crystal-clear communication and immersive audio..Delivers consistent audio performance with an impedance of 32 Ohms, suitable for most devices..Powered by a rechargeable lithium-ion battery for long-lasting wireless performance and convenience..Certified for Microsoft Teams to ensure optimized performance, seamless integration, and reliable communication..Backed by a 2-year limited warranty for added peace of mind and product assurance.

Stay focused with Zone Wireless 2 ES, featuring adaptive hybrid ANC(1) and premium noise-canceling microphones, specifically designed to block ambient noise around you. Custom-designed, 40 mm speaker drivers deliver clear treble and deep bass. Noise-canceling mics with AI-based algorithms ensure your voice comes through clearly, even in noisy spaces..Wireless on-ear business headset designed for professional communication, hybrid work environments, video conferencing, and multimedia use across multiple platforms and devices..Compatible with Windows, macOS, ChromeOS, iOS, and Android..Comes in a sleek, professional dark gray finish that complements any workspace..Made from durable plastic and metal components with soft memory foam ear cushions and a matte graphite coating for a premium, professional finish..AI-powered dual noise-canceling microphones with flip-to-mute boom and adaptive hybrid ANC deliver clear calls and immersive focus..Delivers a wide frequency response from 50 Hz to 20 kHz for clear, full-range sound..36-ohm impedance ensures efficient power handling and compatibility with a wide range of audio devices..Rechargeable lithium-ion battery with USB-C charging..UC certified for universal communication compatibility across leading platforms..Backed by a 1-year limited warranty for added peace of mind and product assurance.

Sounds good? Sounds great Hop on and hop off calls all day long without ever losing a beat. Plug right in and get ready to speak and hear clearly all day. With noise-cancelling, comfortable design, and easy adjustment, your sound comfort will carry you from call to call without interference or frustration. Control the Call Hop on any call with ease. The flexible boom mic blocks the background noise to keep your call focused. The in-line volume control and mute keeps you in control of your environment. Snug and Comfortable These durable vegan leather earcups are designed for all-day comfort. Just adjust the head strap to be perfectly snug so you can hop on and off calls all day without soreness. Simple USB-A Connection A simple USB-A plug will have you on the call in seconds with a connection that won’t glitch out or lose power. WWCB Certified The Works With Chromebook badge on a device means it’s optimized to work with your Chromebook and other Chrome OS devices. Enjoy a seamless experience across Works With Chromebook certified accessories. Look for the Works With Chromebook badge and rest assured that it’ll all work together..The HP G2 USB Headset (428K6AA) is classified as a wired, binaural headset, designed for professional and personal use, particularly in environments that require clear audio communication..Operating Systems It works with Windows 10, macOS, and Chrome OS. This versatility makes it suitable for various devices.This is a wired headset, which means it connects directly to devices using a USB Type-A port its effective range is determined by the length of the cable, which is typically around 6 to 10 feet. This length provides sufficient flexibility for use during calls and meetings while remaining connected to a computer or other compatible devices.Headset is available in black color his neutral color is designed to fit well in professional environments, offering a sleek and understated appearance suitable for business settings. The headset features a binaural (over-the-head) design, meaning it covers both ears. This design enhances immersion and audio quality, making it ideal for long hours of use, such as during calls or video conferences.It features a cord length of approximately 6 feet (1.83 meters). This provides sufficient length for flexibility during use while connected to a device..The earcups are made with vegan leather, which provides a soft touch while being durable and easy to clean. The headband typically features a lightweight, padded design, often using plastic or metal for the structure with additional cushioning for comfort. The cable is made of flexible rubber or PVC material, designed to withstand daily use while maintaining flexibility..The headset features a boom microphone, which is designed to pick up voice clearly while minimizing background noise. It has noise-canceling capabilities, which help reduce ambient sounds, enhancing clarity during conversations. The headset is designed for stereo sound, providing a balanced audio experience suitable for both listening and speaking​..The HP G2 USB Headset (428K6AA) features a USB Type-A wired connector. This type of connection allows for easy plug-and-play functionality, making it compatible with a variety of devices, including most computers and laptops.The microphone sensitivity is approximately -42 dB. This indicates how effectively the microphone can capture sound, with a lower value typically signifying better sensitivity in picking up quieter sounds. The microphone operates within a frequency response range of 100 Hz to 10 kHz. This range is effective for voice communication, ensuring clear audio capture during calls and meetings.The HP G2 USB Headset (428K6AA) has an impedance of 32 ohms. This impedance level is typical for headsets, ensuring compatibility with various devices and efficient power usage during operation.The HP G2 USB Headset (428K6AA) is powered via a USB Type-A connection, meaning it draws power directly from the connected device, such as a computer or laptop. This design eliminates the need for an external power source or batteries, making it convenient for users who want a straightforward, plug-and-play solution..This head holds Unified Communications Certified (UC Certified) This indicates that the headset is optimized for use with various unified communication platforms, ensuring compatibility and performance in business settings​.The HP G2 USB Headset (428K6AA) typically comes with a 1-year limited warranty.

Hear with Complete Clarity via USB: The Kensington USB Hi-Fi Headphones with Microphone is a durable headset that provides high-quality stereo sound, a microphone designed to support voice clarity, and best-in-class comfort features. Supporting common core learning standards, the headphones provide a max output of 94db for safe listening and the mic supports the latest audio-based classroom testing requirements. The Hi-Fi USB Headphones with Microphone is suitable for students, call centers, business professionals, and recreational gamers. Compatible with Windows, Mac and Chromebook for a simple plug and play experience. Features & Benefits: High-quality stereo sound is provided through powerful 40mm drivers with deep bass and a wide dynamic range. Best-in-Class comfort. Ear cups swivel to enable teachers or call center instructors to listen in and support. Noise-cancelling microphone included. Multi-Device Compatibility - works with Windows, Mac and Chromebook devices. Maximum output is 94db for safe listening..Padded headband comfortable enough for extended wear.Fully adjustable ABS head strap to fit all sizes.Noise-reducing circumaural earcups lower external noise so volume can be set at levels recommended for hearing safety.Highly durable Cali Tuff cord made of braided, PVC-jacketed material with reinforced earcup entry point resists chewing, cutting and separation.6' straight cord long enough to avoid accidental pull out.Inline volume control ideal for easy access.Rugged ABS plastic earcups resist breakage in high-use situations.2-Year Warranty

Stay focused with Zone Wireless 2 ES, featuring adaptive hybrid ANC(1) and premium noise-canceling microphones, specifically designed to block ambient noise around you. Custom-designed, 40 mm speaker drivers deliver clear treble and deep bass. Noise-canceling mics with AI-based algorithms ensure your voice comes through clearly, even in noisy spaces..Wireless on-ear business headset designed for professional communication, remote collaboration, and multimedia use..Compatible with Windows, macOS, and ChromeOS..Wireless Operating Distance Up to 164 feet..Comes in a stylish rose finish that adds a modern, professional touch to any workspace..Crafted from a durable blend of plastic and metal for long-lasting performance. Features soft memory foam ear cushions and a smooth matte rose coating that resists fingerprints and maintains a clean, stylish appearance..Features dual AI-enhanced noise-canceling microphones with a flip-to-mute boom mic for clear voice capture..36-ohm impedance ensures efficient power handling and compatibility with a wide range of audio devices..Powered by a rechargeable lithium-ion battery..UC certified for universal communication compatibility across leading platforms..Backed by a 1-year limited warranty for added peace of mind and product assurance.

Use your headset on almost all operating systems and platforms thanks to the standard 3.5 mm jack connectivity. Forget about background noise with the noise-canceling microphone. Adjust the light-weight headband for the right fit and use your microphone on your left or right side with ease. The simple way to start talking when using computers, smartphones and tablets. Features a standard 0.14 in (3.5mm) audio jack and is compatible with most operating systems and platforms. Get just what you need to hear and be heard clearly. The perfect business headset for voice calls, Skype, webinars and more. The 7.71 ft (235 cm) cable is just the right length to give you the freedom to stand up and stretch during long conversations..Computer headset is perfect for everyday use with compatible electronic devices.he 7.71 ft (235 cm) cable is just the right length to give you the freedom to stand up and stretch during long conversations..Enjoy clear audio for music, games and calls. A reliable headset for daily tasks including video calls with family or colleagues..Boom can rotate 180° to be worn on the left or right. Flexible mic can be positioned for better voice capture and background noise reduction. Boom can be tucked out of the way when you’re not using it..3.5mm jack provides easy plug-and-play operation.Sturdy yet lightweight stereo headset has a broad range of adjustment. Ultra-soft foam ear cushions provide hours of comfort..Connects to computers that utilize separate 3.5 mm audio jacks for microphone-in and audio-out ports. Not compatible with Chromebook, tablets or Mac ..This product has been certified by Logitech to meet Google's compatibility standards. Google is neither responsible for the operation of this product nor its compliance with any applicable or other safety requirements. This product is serviced and supported exclusively by Logitech in accordance with the terms and conditions of the product. Please contact Logitech directly for technical support and customer service. Chromebook and the "Works With Chromebook" badge are trademarks of Google LLC..1-year manufacturer limited warranty.Used for Computer, smartphone and tablet.Talk to friends and colleagues hands-free with this Logitech binaural over-the-head stereo headset.

Communicate without distraction or wires with the Evolve2 65 Stereo Wireless On-Ear Headset from Jabra. Utilizing wireless Bluetooth technology and an included USB Type-C adapter, you can take important calls at your desk or walking the halls. To stay focused, Jabra incorporates isolating oval memory foam ear cushions and an angled earcup design to maximize passive noise isolation. A call can come at any time, which is why Jabra integrated a powerful battery that gives you up to 37 hours of power..On-ear stereo headset designed for professional use with phones and computers in hybrid work environments..Compatible with computers, mobile devices, and leading UC platforms..Offers a wireless operating range of up to 98 feet for flexible movement during calls and meetings..Sleek black finish with an on-ear headset design for professional comfort and style..Features ear cushions made of soft leatherette and memory foam for enhanced comfort and passive noise isolation..Includes 3-microphone call technology with digital signal processing and passive noise cancellation for clear audio..USB-C connector for wired charging and connectivity with compatible devices..Impedance rated at 16 ohms, suitable for use with mobile devices and computers without external amplification..Powered by a rechargeable lithium-ion battery with up to 37 hours of wireless talk time..UC Certified for seamless integration with leading Unified Communications platforms and softphone systems..Backed by a 2 year limited warranty.

The Delton 30X noise-canceling two-ear wireless Bluetooth headset has been redesigned with your needs in mind. Delton's engineers listened to your feedback and designed a cushioned two-ear adjustable wireless Bluetooth headset with memory foam ear pads, intuitive controls, a long-lasting battery, and all the features you need to get the job done. The included auto-pair USB dongle makes setup super simple: just plug in, turn on, and you're ready to go..Computer and phone wireless headset great for working from home, office, or on the road.Wireless Bluetooth technology provides unparalleled mobility.Auto-pair USB dongle makes pair to any laptop or PC super simple.Ergonomically designed with soft memory foam ear cushions, an extendable cushioned headband, and intuitive controls.Uses Delton's proprietary audio chipset to make sure you're heard clearly no matter where you are or what's in the background.Packs a powerful battery that offers up to 30 hours of talk time and 200 hours of standby time.Wireless Bluetooth connectivity makes the headset compatible with any PC or laptop, all iPhones, and all Android phones.Boom mic rotates 270-degrees, so you can comfortably work from either your left or right side.Adjustable headband and soft memory foam cushioned ear pads make this headset one of the most comfortable two-ear headsets out there.Package includes: headset, USB charging cable, auto-pair USB dongle, and headset storage hook.1-year manufacturer limited warranty.⚠ WARNING: California Proposition 65 Warning. This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.govSafety Data Sheet

Yealink WH68 feature DECT & Bluetooth Hybrid Wireless Technology, delivering stable connectivity up to 185m (606ft) with seamless switching between modes. Equipped with 4-mic Hybrid Active Noise Cancellation (ANC) and AI-powered noise suppression, it effectively eliminates background noise for crystal-clear calls. The ergonomic design with plush ear cushions ensures all-day comfort. With extended battery life?6 hours in DECT mode, 32 hours in Bluetooth mode梚t keeps you productive and connected without limits..On-the-ear headset comes in black, comfortable for all-day wearing.Certified for Microsoft Teams: Optimize for seamless integration with Windows and macOS, Android, iOS, ensuring reliable performance across platforms..Long Wireless Range: Enjoy up to 606 feet of wireless freedom with DECT technology, ideal for mobile professionals and open office setups..Comes in black.Material of Ear Cushion: Leather ear cushion.4-Mic for hybrid ANC &4-Mic for Mic Noise Cancellation providing you an immersive experience and redefine your perception of noise reduction.Wireless DECT & Bluetooth Connection.Microphone frequency range: 20Hz- 20KHz.Input Impedance 32 Ohms.Charged via USB charging cable.Teams Certification.Reliable Warranty Coverage: Backed by Yealink 2-year limited warranty.Yealink WH68 headset is designed for efficient communication, integrating DECT and Bluetooth dual-mode technology for seamless multi-device switching

Outstanding outcomes require outstanding call performance, and seamless, professional audio makes all the difference. They took the incredible call performance of world-leading Evolve Series, and they made it even better, building in three strategically placed powerful professional microphones and adding advanced digital chipset and latest signal processing technology. The result is outstanding call quality, every time. It's not just a great call. It's the new standard of great calls..Professional wireless headset designed for office, remote work, and unified communications applications..Compatible with PCs, Macs, smartphones, and major UC platforms..Wireless operation range extends up to 98 feet for unrestricted mobility during calls and meetings..Black on-ear headset design with a sleek, professional look for everyday business use..Ear cushions made from soft leatherette and memory foam for enhanced comfort and passive noise isolation..Features a 3-microphone array with digital signal processing for crystal-clear voice transmission..USB-C connector for charging and optional wired connectivity with compatible devices..Impedance rated at 16 ohms, optimized for use with mobile devices and computers without external amplification..Powered by a rechargeable lithium-ion battery, offering up to 37 hours of wireless talk time on a single charge..UC Certified for seamless integration with leading Unified Communications platforms like Zoom and Cisco..Backed by a 2 year limited warranty.

The Cisco Headset 500 Series delivers surprisingly vibrant sound for open workspaces. Users can stay focused in noisy environments with rich sound, exceptional comfort, and proven reliability. The 500 Series offers a lightweight form factor that is comfortable to wear, even for an entire workday. It's designed for workers who spend a lot of time wearing headsets for voice communications and listening to music..This wireless phone headset is perfect for everyday use with compatible electronic devices.Black on-ear design with high-comfort ear pads.DECT frequency band transmits your voice and gives transcendent voice and sound quality.Phone headset captures audio cleanly at frequencies of 150Hz-6800Hz.Impedance: #10 Ohms.Rechargeable battery provides up to 10 hours of working time

Yealink UH37 is a professional USB-wired headset. With a 35 mm speaker and excellent stereo sound, you can have an extraordinary audio experience for calls and music. The noise reduction technology of the dual microphone allows you to have clearer calls, and the noise-isolating foam oval ear cushions deliver great passive noise cancellation. The headset is ultra-lightweight and extremely comfortable, with a skin-friendly leather headband and ear cushions for all-day comfort. Whether working remotely in the office or at home, UH37 lets you focus on your work and improve your productivity. It can work seamlessly with major UC platforms and integrate natively with Yealink IP phones..On-ear stereo headset with soft leather ear cushions and headband for all-day comfort.UC-certified for seamless integration with Windows and macOS platforms.Dual microphones with advanced noise cancellation ensure clear voice transmission.35mm speaker delivers rich stereo sound for calls and music.Oval-shaped foam ear cushions provide passive noise isolation for better focus.Wired USB-A/USB-C connection for flexible, plug-and-play compatibility.Microphone frequency range: 100Hz–10KHz for detailed voice clarity.Input impedance: 32 Ohms for balanced audio performance.USB powered for consistent connectivity and ease of use.Headset cable length: approximately 5.58 ft.Comes in black for a sleek, professional appearance.Yealink UH37 is a professional USB-wired headset. With a 35 mm speaker and excellent stereo sound

Jabra Evolve2 75 is ideal for those who need maximum flexibility. An ergonomic, biometrically-measured headset with outstanding audio technology, and fully adjustable Jabra Advanced Active Noise Cancellation, for superior call and music performance in complete comfort. Everywhere..This mobile headset is great for everyday use with compatible electronic devices.Provides wired connectivity with 3.94' cable.Black on-ear design with high-comfort ear pads.Cord length: 3.94'.Foam construction provides reliability where it matters.SafeTone technology and PeakStop technology to improve the quality of the headset use.USB mobile headset can be used across many different devices without hassle.Mobile headset captures audio cleanly at frequencies of 5Hz-20000Hz.Input impedance: 16 ohms.Rechargeable battery provides up to 36 hours of working time.Active noise canceling so you hear only the music.2-year manufacturer limited warranty.Includes carrying bag, USB-C charging cable, and Jabra Link 380 USB Adapter

Whether you're working in the office or on the go, background noise can really disrupt your flow. Put on your Evolve2 65 and feel the noise around you instantly fade, as the isolating foam oval ear cushions and pioneering new angled earcup design work to effectively block out your surroundings, giving you passive noise cancellation like you've never experienced. You could say it's like a portable quiet room for your head..Mono on-ear wireless headset ideal for professional communication in office, remote, and hybrid work settings..Compatible with Windows, macOS, and leading UC platforms..Wireless operation range of up to 98 feet provides freedom to move around while staying connected..Black mono on-ear headset featuring a sleek, minimalist design with a padded headband and soft ear cushion for all-day comfort..Features leatherette and memory foam ear cushions for enhanced comfort and passive noise isolation during extended use..Includes advanced 3-microphone call technology with digital signal processing..16-ohm impedance delivers efficient audio performance with clear sound quality across various connected devices..Powered by a rechargeable lithium-ion battery offering up to 37 hours of wireless use per charge..UC Certified for universal compatibility with leading Unified Communications platforms across various operating systems..Backed by a 2-year limited warranty for added peace of mind and product assurance.