iPartner Mini Battery Pack and Charger for iPod, iPhone 3G, 3GS and iPhone 4 by Cyanics Power and charge your iPhone (3G / 3Gs) or iPod and extend your play/talk time. Advanced internal circuitry prevents device from power surges; overcharging and short-circuiting High-capacity (1,400 mAh), rechargeable Lithium-Ion battery pack for increased energy efficiency Keep connected to your iPhone or iPod and able to connect headphone to ipod while charging your device. Retractable cable extends up to 2.5 feet Mini USB cable included to power and charge other mobile devices, such as cell phones, PDAs, and more. Compatibility: iPod nano 3G, 4G; iPod Video & Classic 5G, 5.5G, 6G; iPod touch 1G and 2G iPhone 3G