1)Bluetooth Version:Bluetooth V2.0 2)73 keys mini keyboard 3)Built in rechargeable Li-ion battery,Micro USB port charging 4)Built in intelligent power manage software for power conservation 5)Working Range:10m 6)Charging Time:3-4 hours 7)Matching with system press Fn+RF 8)The device must built in Bluetooth function. 9)The mobile operating system should be one of following -Computers with Windows/Mac Linux -Handhelds with Android/Windows Mobile(6.0&later) -Nokia Symbian S60(V3.0&later)OS -Apple iPad,iPhone/Touch in 4.0 OS -HTPC with built-in Bluetooth.