It is portable power supply which has two functions of backup battery and the charger. It outputs energy through USB port. Via different kinds of connecter plug, it can supply power for mobile phone, Sony PSP station, iPod, MP3, MP4, iPhone 3GS, and other electronic equipments anywhere and anytime. USB multi-functional portable charger is specially designed for the digital products such as cell phone, MP3, MP4, PDA, digital camera, DV camera, PSP game player, portable DVD, Bluetooth earphone, iPod. http://www.chinabuye.com/2000mah-multifunctional-charger-for-ipone-ipod-camera