Innergie Duo 21 Watt 2 port 2.1 Amp USB Auto Adapter for iPhone, iPod, and all Smartphones Ultra-fast Dual USB Auto charger 21 Watt capacity with two USB ports each with 2.1 Amps output Capable of charging two tablets, smartphones or other devices at the same time Blue LED power indicator on the front of the charger indicates the Duo is powered and ready to charge your devices 12 V DC input