Feature: 1. Programmable Keys: All keys of this mini keypad are programmable, you can set all keys function of standard for Win keyboard. 2. USB or BT Connection: This programmable keypad supports wired USB or wireless BT connection. Mini size saves more table space and ensures portability. 3. Knob Function: This gaming keypad is designed with 1 knob that can be set to zoom in and out, following song, the volume up, volume down, pause, play and other functions. 4. Wide Application: This 4 key keypad is suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields. 5. Durable Acrylic: This mini gaming keyboard with 4 keys and 1 knob adopts durable acrylic material, inbuilt 200mAh rechargeable battery. Specification: Item Type: Mini Keypad Material: Acrylic Key Type: 4 Key Mechanical Keypad +1 Knob (knob Can Be Used As a Key to Press) Battery Type: Inbuilt 200mAh Lithium Ion Battery Applicable Equipment: Ideal for Most Computer. Package List: 1 x Mini Keypad4 x Foot Pad1 x USB Cable1 x User Manual