High quality Credit card shape portable power bank 4000mAh for smart mobile phone. New promo gift 2015 innovative name card size slim shape power bank 4000mah power bank external battery. Rated input:DC5V,1A Rated output:DC5V,1A Compatible Models. Recharge cycles:charge to 100% up to 500 times Indicators:1 battery level LED Other Features 4000mah capacity, offer extra hours for your mobile phone; portable for both in door and outside; with a micro USB port; Packing List 1x Power bank 1x user manual 1x USB DC cable, connectors