1.Rechargeable Li-ion battery 2.Super slim 3.Bluetooth 2.0 4.QWERTY keys 5.fast delievery The Keyboard (NOT case) is a perfect companion for your smart phone, PC, PS3,HTPC,that makes typing, chatting, and playing game easier than ever!The power pack case is specially designed to charge the iPhone4/4S with intelligent control,and it support data synchronization(When using the Power pack to charge your iPhone 4/4S, you can sync youriPhone 4/4S with iTunes). Features of keyboard:1.Pocket size, slim and perfectly fit design,and the hard case offers high protection for your iPhone4/4S.2.Support mobile operating system:Apple iPhone&iPad 4.0 and later, Google Android1.6 and later,Windows Mobile 6.0 and later, Nokia Symbian S60 V3.0 and later.3.Color LED for working status indication.4.Built-in intelligent power manage software for power conservation,With the automatic shutdown function when not Bluetooth connection .5.Working distance up to 10 meters (33 feet).6.50 responsive, accurate standard QWERTY keys lay out.7.Built-in 350 mAh Li-polymer rechargeable battery lasts for 60 working hours.8. Charge by Micro-USB port.9.Product dimension:115(L) x 60(W) x22(T) mm(folded).Specifications of Keyboard:1.Bluetooth Version:Bluetooth V3.0,Class 22.Operation voltage: 3.7V DC3.Operation current: <5mA4.Standby current: 1.2mA5.Sleep current: <0.7mA Features of Power pack:1)Polymer lithium-ion batteries2)Capacity: 1800mAh3)Output voltage: DC5±0.1V4)Output current: ≤700mA5)Input voltage: DC5±0.2V6)Input current: ≤500mA7)Charging time: 3-4hours8)Cycle life: >500times9)Standby time: ≥200hours10)Talk time: Up to 6hours on 3G /Up to 8hours on 2G11)Internet use : Up to 4hours on 3G /Up to 5hours on Wi-Fi12)Audio play: Up to 25 hours13)Video play: Up to 5hours