Feature 1Programmable Keys: All keys of this mini keypad are programmable, you can set all keys function of standard for Win keyboard. 2USB or BT Connection: This programmable keypad supports wired USB or wireless BT connection. Mini size saves more table space and ensures portability. 3Knob 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. 4Wide Application: This 4 key keypad is suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields. 5Durable Acrylic: This mini gaming keyboard with 4 keys and 1 knob adopts durable acrylic material, inbuilt 200mAh rechargeable battery.Item Type: Mini KeypadMaterial: AcrylicKey Type: 4 Key Mechanical Keypad +1 Knob (knob Can Be Used As a Key to Press)Battery Type: Inbuilt 200mAh Lithium Ion BatteryApplicable Equipment: Ideal for Most Computer .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Mini Keypad4 x Foot Pad1 x USB Cable1 x User Manual