... other digital device. Mobile Phone Batteries function:1. Double usb output,Use USB to supply the power,charge by usb data ... where . With 6 free different brand transfer connector , can charge different mobile device .2. 8400mAh high capacity 18650 Lithium core,standby ... of tablet pc , smart phone, MP3,MP4,portable mobile device , can charge two mobile device at the same time .4. Smart controller, ...