Bolse&reg; Cell Phone Chargers, 4 USB Port Portable AC Rapid Charger - 20 Watt / 4A For iPhone, iPad, Samsung Android Smartphones and other usb powered devices Compatible with iPhone, iPad, HTC phones, Samsung Galaxy Tab, Samsung Galaxy Phone, Samsung Galaxy Note, Blackberry, MP3 players, Digital Camera, & other USB devices Use your existing USB charging cables to charge most USB powered devices. Easy-to-see LED confirms whether USB charger is properly connected Highest Power rating at 20W / 4 Amps output, at least twice the power of any other four port charger. Compact Design and Flip Down AC Prongs make it easy to carry on travel. Sophisticated circuit design with over-heated, over-current, over-charging protection. Charging will automatically stop when battery is full.