Ideal for long flights, outdoor activities, or anytime your devices might run out of power High capacity Li-ion battery cell increases devices usage time approx. 3-4 hrs Supports most portable devices with USB charging capability such as iPod , Cell Phone, PDA and MP3 player Compact size Standard USB ports and ON/OFF switch Recharge from computer's USB port convenietly with included cable Built-in battery tester button with battery level LED indicator Power On/Off switch to save battery when not in use Includes one USB A to mini B male cable