This rechargeable mobile power bank's lithium polymer batteries give you 4,000mAh of backup power for your mobile phone or other digital device. It has a strong but lightweight aluminum case and features a smooth metallic surface and charging indicator lights. Includes a micro USB cable. Output is rated at 1A. This product has undergone the most rigorous testing in the industry and is FCC VOC, MSDS, UN38.3, Prop 65, 7P, UL60950-1, UL1642, CEC/BC certified and UL® listed.