The rechargeable mobile power bank from Xoopar® has lithium polymer batteries that give you 4,000mAh of backup power for your mobile phone or other digital device. It has a strong but lightweight case, a digital charging percentage display, and features a color accent ring. Includes a micro USB cable to charge the power bank. Output is rated at 1A. This product has undergone the most rigorous testing in the industry and is UL®Listed, UL1642, UL2056, UL60950-1, CEC/BC, FCC VOC, CA65 ,7P, MSDS and UN38.3.