The iSound Dual USB Car Adapter allows you to charge up to 2 devices simultaneously conveniently inside your car. The two USB ports have an output of 1A and 2.1A allowing you to charge several combinations of items at the same time, for example 2 smartphones or 2 MP3 players or 1 tablet and 1 phone and many more. The device also features over-heat and over-current protection. Never lack power on the road again with the iSound Dual USB Car Adapter!