1. The num lock function belongs to any other currently connected keyboards. The mechanical switch keypad can provide a fast response. 2. Compared with other standard keypads, the 21 keys at the top are extended, including Esc, Tab, Back Space, and FN. 3. The mechanical numeric keypad has 3 backlight models and 6 backlight brightness levels that can be adjusted. By simultaneously pressing the FN key and another key, you can change the backlight and brightness. 4. Keyboard Connection: WIRED 5. Type: ERGONOMIC 6. Interface: bluetooth 7. Brightness adjustment: 6 levels 8. Backlight mode: 3 types 9. Style: weak 10. Pressure: 45g +/- 20g 11. Luminous: white 12. Line length: 1.5 () 13. Whether to support ergonomics: support 14. Backlight function: support backlight 15. Key technology: mechanical shaft 16. Waterproof function: does not support waterproof 17. Do you have a hand rest: No 18. Shortcut key: none 19. Whether there are multimedia function keys: none 20. Connection with computer: wired 21. Whether to support plug and play: support 22. Number of keys: 21 () 23. Type: Numeric keyboard 24. Applicable models: general 25. Suitable for: notebook users; financial, banking and securities workers; counter cash registers; mechanical keyboards without a keyboard area 26. Size: 12.3 x 8.2 x 4.2cm 27. Color: White 28. Material: ABS+PBT 29. Package Contents: 1 x Mechanical Numeric Keypad. Only the above package content is included, and other products are not. 30. Note: Light reflection and different displays may cause the color of the item to be a little different from the real thing. The allowed measurement error is +/- 1 - 3cm.