Charge on the go. USB charger plugs into your car 12V outlet to charge phones, MP3 players and most USB rechargable devices. Converts 12v auto socket into 5v DC current at 1000mA.Charges many battery-powered devices that use USB output.Compact design easily stores in glove compartments, backpacks, purses, desk drawers, and briefcases. Great assortment of vibrant colors. 12/display and 144/case.