Rii K12and Office Computer Notebook Silent 2.4GHz Wireless Mini Keyboard 1. 5.0mm ultra-thin stainless steel design 2. Scissor-foot switch keyboard, providing a comfortable and pleasant typing experience 3. Built-in rechargeable lithium-ion battery, wireless operation is more convenient 4. Touchpad: supports multi-finger operation, automatic sleep and wake-up functions 5. Connection port: supports USB 2.0 and above 6. RF mode: 2.4GHz 7. Transmission distance: about 10 meters 8. Battery capacity: 300mAh polymer lithium-ion battery 9. Charging voltage: 4.4V -5.25V 10. Charging current: 300mA 11. Working voltage: 3.7V 12. Working current: less than 14mA 13. Weight: about 210g 14. Size: about 26 x 8.3 x 1.35cm Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.