portable power 1,Built-in high-capacity li-ion polymer battery,5000mah 2,500 times ... 4/I-pad /2 usb port Product features: 1. Built-in high-capacity li-ion polymer battery, 5000mah, to make sure ... . When charging, the LED will light on one by one in blue light , and will switch off when it is filled ... voltage is 5V, such as: ipad, iphone3G, 4G, mobile phones, MP3, MP4, PSP, etc