a portable external battery pack for laptop, cellphone, MP3, MP4, digital cameras. ... charger and spare batter 1. This product is a portable external battery pack for Notebook computer, mobile phone, MP3, MP4, ... such as mobile phone, digital cameras, MP3, MP4 ,PSP and PMP through different connection lines.5. It is convenient ... device without power for you at any time. Portable battery pack and charger