Chiworld Bluetooth Folding Keyboard for iPad, iPad 2, iPhone, Android Smartphones IPK-IK082025 10 meters Bluetooth(2.0 Standar) folding keyboard connect PC system supported: Windows 2000, XP, Vista (32-bit) Smart mobile system supported: iPhone OS 4.0+ (iPhone, iPad), Nokia Symbian S60 and above, Android 2.3 built-in rechargeable li-ion battery(Battery capacity: 350mAh), continue working time is about 200 hours, with mini USB for charging