MK321BT Bluetooth 5.1 3-Key Customizable Programmable Keypad for Gaming, Office, PS, 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 available through software; one-touch activation 4. Suitable for office tasks, gaming, multimedia, and other applications 5. Lightweight and ergonomic design; non-slip keys with fast rebound for long-term use 6. Simple plug-and-play operation; no driver required; connect via data cable and use after saving software settings 7. Game mode: One-click execution of multiple game commands; Office mode: One-click access to multi-layer folders; Web navigation: One-click opening of favorite pages or apps; Design mode: One-click execution of combination key shortcuts 8. Rounded, ergonomic button design fits fingertip comfortably 9. Customize button functions via software and save settings directly to the device 10. LED backlighting under keys with customizable lighting effects through software 11. Green switch buttons provide crisp tactile feedback with audible click 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 switch 6. Functions: Keyboard, mouse, multimedia, string input, gaming, macro programming 7. Button lifespan: 50 million cycles 8. Dimensions: 7.5 x 3.7 x 2.8 cm 9. Weight: Approximately 32g