Charge your device on the go anywhere! Our Sybil UL certified 4000 MAH Slim Power Bank comes with anodized aluminum housing and arrives in an individual box. Connect any USB cable, or use the included Micro USB cable to recharge devices and the power bank itself. Lithium ion grade A non-recycled battery with auto on/off overcharging function. Outputs 5 Volts/1.0 Amp.