Promotional Power Bank, 4000 MAH Power Bank - UL Approved & CE Certified, This slim power bank features a built in, UL approved, li-ion rechargeable battery with 4000 mAh capacity to give you up to 3 hours of charging time. The input output is 5V/1A and the components are certified for CE, FCC and ROHS. It includes a micro-USB cable and comes packed in white tuck box. ... #PBK400 $9.12/each.