Fangrui Product Details 1. Sf109 Tree Texture Bluetooth Keyboard Leather Case For Microsoft Surface Pro 4 5 6 7(black + Black) 2. Features: 3. Not Only A Protective Case, Built-in Bluetooth Keyboard, More Powerful 4. The Keyboard And Leather Case Can Be Separated Design 5. Bluetooth Chip, Fast Speed, Low Power Consumption, Stable 6. Precise Cutting, Easy Access To All Buttons And Ports, Providing You With Smooth Operation 7. Support Function, Easy To Use 8. Easy To Insert And Remove 9. Tablets Are Not Included 10. Specifications: 11. Bluetooth Standard Interface 12. Effective Operating Distance: 10 Meters 13. Modulation Method: Gfsk 14. Working Voltage: 3.7-4.0v 15. Working Current: Less Than 8ma 16. Standby Current: Less Than 0.3ma 17. Sleep Current: Less Than 50 Microampere 18. Charging Current: More Than 200ma 19. Standby Time: More Than 100 Days 20. Charging Time: 2-3 Hours 21. Lithium Battery Capacity: 200mah 22. Sustainable Working Hours: Not Less Than 30 Hours 23. Lithium Battery Life: 3 Years 24. Button Force: 80+-10g 25. Button Life: 5 Million Clicks 26. Working Temperature: -10-55 Degrees Celsius 27. Charging Port: Type-c 28. Weight: 835g 29. Product Size: 29.8x21.4x2.2cm