Boost Case Leather Flip Case & Extended Battery for iPhone 4 (Black, Fits all models iPhone 4S /4) World first flip down leather battery case for iPhone 4, fits both AT&T and Verizon Finest grade soft touch lambskin leather with microsuede interior 1300 mAh lithium polymer rechargeable battery virtually doubles battery life Charge and sync simultaneously without removing iPhone, ON OFF Power Control Apple certified Made for iPhone product and OTA certified