External Battery, AMagic 8000mAh (3.1Amp+3.1Amp Output) Aluminum Dual USB Ultra Slim Portable Charger External Battery Pack Power Bank - (Silver) Lightweight Pocket Power Bank, Ultra Slim, Portable External Battery Pack - Charge your mobile phones, iPod, and much more, on the go with 6000mAh capacity Dual USB output: Super-fast Charge two smartphones or an iPad at full speed (USB Output 1: 5V 3.1A, USB Output 2: 5V 3.1A); Patented power lock technology with standby time of up to 6 months once fully charged. LED power indicators for checking remaining charge capacity with Low battery Warning 4-Way circuit protection (input over-charging, output over-charging, short-circuit, input-output loop charge) Strong Aluminum alloy housing - Compatible with iPhone, iPad, Samsung, HTC, LG, Sony, Nokia, Motorola, etc