How to Use: Wired connection: plug and play BT connection: Turn on the power button and turn on the BT pairing at the same time. The computer BT searches to connect "HID Keybroad", and the pairing is successful and you can use it. Specification: Item Type: Mechanical Gaming Keypad Material: Acrylic Key Type: 6 Keys Mechanical Keyboard, 1 x Knob (the Knob Can Be Used As a Key to Press) Applicable Equipment: Computer Universal Battery Type: Built in 200mah Lithium Ion Battery Package List: 1 x Mechanical Gaming Keypad1 x Data Line