The MI-7311 car seat headrest mount was designed to to be an adjustable, rear-facing tablet holder that allows your car passengers to view or use any 7" to 11" tablets conveniently from teh backseat of the car. No special tools necessary - the headrest mount can be easily attached and removed from a car's front seat headrest post. The ultra lightweight carbon fiber arm has an adjustable ball and socket system at both ends that all you a wide range of movement for the perfect viewing postion - height adjustable for an adult or child passenger.