The Cellet 4000mAh Power Bank Portable Charger is the perfect charging solution when an electrical outlet is out of reach. Compact and portable, this rechargeable power bank is built with 2 universal USB ports and with a micro USB port for charging via computer or wall adapter. At 2 amps each port, it can charge two USB powered devices simultaneously. Rubberized finish and mini suction cups attach to the back of the phone case for convenience.