MK321BT Bluetooth 5.1 3-Key Customizable Programmable Keypad for Gaming, Office, PS, and Macro Functions Features: 1. Power supply: Built-in 230mAh lithium battery, rechargeable via USB Type-C cable 2. Comfortable buttons with multi-system compatibility 3. Multi-function customization through software, one-touch trigger capability 4. Suitable for office tasks, gaming, multimedia, and other applications 5. Lightweight and comfortable design; non-stick keys with quick rebound for long-term use 6. Simple operation—no driver required; connect via data cable, save settings in software, and use immediately 7. Game mode: One-click execution of multiple game commands; Office mode: One-click access to multiple folders; Web navigation: One-click opening of favorite pages or apps; Design mode: One-click combination key commands 8. Ergonomic rounded arc buttons designed to fit fingertip contours comfortably 9. Button functions can be programmed via software and saved directly to the device 10. LED backlighting under each key; customizable lighting effects through software 11. Green switch mechanism offering crisp tactile feedback, clear tory response, and strong mechanical feel 12. Anti-slip rubber feet for enhanced stability during use Specifications: 1. Material: Plastic 2. Number of keys: 3 3. Interface: USB 4. Cable length: 1.5 meters 5. Switch type: Green shaft 6. Functions: Keyboard, mouse control, multimedia control, string input, gaming, macro programming 7. Button lifespan: 50 million keystrokes 8. Dimensions: 7.5 x 3.7 x 2.8 cm 9. Weight: Approximately 32g