... supply device use, can think of your notebook computers, mobile phones, MP3, MP4, PSP, PDA, IPOD, mobile DVD, ... any time and any places.Features:1. Power bank for phone, Mp4, digital devices, etc.2. Built-in ... power off fuction if it is not in charge for 20 seconds, which can largely save the energy. ... Charging method: 1.Charge for Power Bank: Connect the USB cable with you power ...