DigiPower JS-Talk Home and Car Power Kit for iPhone and iPod - Charger - Retail Packaging - Black Self-contained battery pack for iPhone & iPod (all models) 1200mAh - almost doubles iPhone battery life 3-step LED charge status Single button for battery charge status and sync operation Pass-through mode for iPhone charge and sync to computer Works with iPhone 4, iPod Touch 4G and all other iPhones and iPods Gives you an extra 3.5 hours of talk time, seven hours of video, and twenty-two hours of audio playback 1200 mAh rechargeable battery Three step LED charge status Built-in USB cable