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Make sure everyone in your building is aware of potentially hazardous situations with this First Alert smoke alarm and carbon monoxide detector combo pack. Each unit runs on 9-volt batteries, eliminating the need for hardwired installation and providing flexible placement options. An electrochemical sensor detects the presence of carbon monoxide, while an ionization smoke sensor picks up signs of smoke. Both devices in this First Alert smoke alarm and carbon monoxide detector combo pack feature 85dB alarms, making them easy to hear in the event of an emergency.