Fangrui Product Details 1. Kn-980 28 Keys Portable Wireless Digital Quiet Keypad Computer External Digital Password Keypad 2. Material: Abs Plastic 3. Key Number: 28 Keys 4. Interface: Usb 5. Key Technology: X-architecture 6. Connection: 2.4g Usb Wireless Connection 7. Power Supply: 1 Aaa Battery (not Included) 8. Applicable Systems: Windows Xp78vistawindows 2003 And Other Systems 9. Weight: About 250 G 10. Size: About 12.7 X 10.3 X 0.6 Cm 11. Features: 12. Wireless Connection, Plug-and-play, Slim And Portable, With Waterproof Function 13. 28 Keys Enhanced Layout, Fast, Improve Work Efficiency 14. 2.4g Wireless Transmission, Stable Data Without Constraints 15. Scissor Foot Structure, Light And Comfortable, Fast Response Time 16. Keyboard Characters Uv Coating Printing, Clear Handwriting Is Not Easy To Wear Out 17. Anti-skid Silicone Feet, Stable But Not Fluttering, Thoughtful And Easy To Use, Reduce The Chances Of Pressing The Wrong One 18. Applicable To A Variety Of Office Occasions, To Meet The Corporate Finance, Banks, Social Security Fund Centers, Major Business Halls, Supermarkets And Other Occasions Of Office Needs