T11B-AS Skin Feel Pen Slot Touch Pad Backlight Bluetooth Keyboard Leather Tablet Case For iPad Pro 11 2021&2020&2018(Sky Blue) 1. Bluetooth 3.0 standard interface 2. Effective operating distance: 10 meters 3. Modulation method: GFSK 4. Working voltage: 3.0-4.2V 5. Working current: 2.5mA 6. Standby current: 0.3mA 7. Sleep current: 40uA 8. Charging current: 200mA 9. Standby time: about 100 days 10. Charging time: 3-4 hours 11. Lithium battery capacity: 450mah 12. Sustainable working hours: 100 hours 13. Lithium battery life: 3 years 14. Button force: 80+-10g 15. Button life: 5 million clicks 16. Working temperature: -10-55 degrees Celsius 17. Three-color backlit keyboard 18. Keyboard with trackpad 19. Not just a protective case, built-in bluetooth keyboard, more powerful 20. Bluetooth chip, fast speed, low power consumption, stable 21. Precise cut for easy access to all buttons and ports, giving you smooth operation 22. Stand and pen tray function, easy to use 23. Tablets are not included 24. Size: about 25.3x20.5x2.2cm Note: The touchpad can be used for ios system 13.4 and above