External Sliding Bluetooth Keyboard Case for iPhone 4 ( Fits AT&T and Verizon iPhone 4 ) Fits AT&T and Verizon iPhone 4, Rubberized hard shell case Sliding QWERTY keyboard, Bluetooth wireless connectivity Home and Search specialized keys for iPhone 4, Battery type: Lithium Capacity: 200 mAh, Operating current: 3 mAh Standby current: 0.2 mAh, Operating voltage: 3.7V