Specification: Item Type: Wireless Mini Full Keyboard 2.4GHz wireless mini QWERTY keyboard, touchpad and presenter combination Size: Length: Approx. 152mm / 6 in Wide: Approx. 57mm / 2.2in Instruction: Receive and send via USB, plug and play Battery Type: Polymer lithium battery Battery Capacity: 300mAh System Support: For Windows 2000 / XP / Vista / 7 / Win CE/for Linux /for Android /for os x Package List: 1 x Mini Keyboard 1 x Charging Cable 1 x User Manual 1 x USB Receiver Note: The built?in lithium battery cannot be removed.