Feature: 1. Customizable: One handed keypad can be customized with a total of 4 keys and a knob, each knob can be customized with clockwise, counterclockwise and pressed functions 2. Dual Mode Connection: 4 keys one handed keypad supports wired USB and wireless BT dual mode connection, detachable USB cable, easy to use. 3. Programmable: DIY programmable keyboard all keys are programmable, you can set for Windows keyboard standard all key functions, 4 keys design, the number of keys is reasonable, suitable for a variety of programming settings. 4. RGB Backlighting: 4 keys mechanical keyboard with RGB backlighting for more gaming experience, you can connect the gaming keyboard (plug and play) and another keyboard at the same time on the same computer without interfering with each other. 5. Applicable Scenarios: Gaming keyboard is compact and portable, can be carried around, suitable for office, gaming, music, media, industrial control, laboratory, production line testing and other fields. Specification: Item Type: USB Mini 4 Key Keypad Material: Acrylic, ABS Number of Keys: 4 Keys Custom Knob: 1 Switch: Mechanical Blue Switch Light Effect: RGB Connection Mode: Bluetooth Connection Charging Interface: Type C Applicable Models: Computer Universal Battery Type: 300mAh Lithium Ion Battery (Ship with Inbuilt Battery). Package List: 1 x Keyboard (Ship with Inbuilt Battery)1 x Type C Cable4 x Footpad1 x User Manual