This is the durable backup battery that can recharge a smartphone up to six times on a single charge. Its 16,750 mAh lithion-ion battery supplies power to tablets, smartphones, and other electronic devices via two 2.1-amp USB ports. It uses integrated smart-charging technology that adjusts the energy output of each port to optimize the recharging speed of plugged-in devices. Constructed from a crush-proof ABS composite, it has a built-in shock absorber and four LEDs that indicate battery level. It recharges in eight hours via an included micro USB cable and also provides pass-through charging. 5" L x 2 3/4" W x 1" D. (12 oz.)