XtremeMac IPP-IM4-13 Form-fitting lightweight design with smooth touch finish 2200 mAh lithium polymer battery provides a full iPhone 4 charge Seamlessly integrated viewing stand for watching movies and using FaceTime Quick charge feature rapidly recharges battery pack in less than 4 hours On/Off switch to conserve battery when not in use // Pass-through micro-USB port with included cable for charging and syncing