PNY DCP2200 2200mAh 1 Amp PowerPack - Portable Rechargeable Battery Charger with built-In 30-pin connector for Apple iPhone STAY CHARGED-2200mAh provides up to 1 charge for your mobile device Plugs directly into your Apple iPhone with 30-pin connector Mini-USB cable included for charging devices and the PowerPack Safe & Reliable Premium quality rechargeable Lithium Ion battery Trusted Brand - Global Memory Leader for 30 Years 24/7 free technical support for all of your questions Works with Apple iPhone 4S/4; Not suitable for use with all iPhone cases Backed by best in market 3 year warranty