A129 TPU Detachable Bluetooth Keyboard Leather Case with Bracket For iPad Pro 12.9 inch 2015 2017(Black) Features: 1. Not just a protective case, built-in bluetooth keyboard, more powerful 2. The keyboard and leather case can be separated 3. Bluetooth chip, fast speed, low power consumption, stable 4. Precise cut for easy access to all buttons and ports, giving you smooth operation 5. Bracket function, easy to use 6. Easy to insert and remove 7. Tablet and stylus are not included Product Specifications: 1. Bluetooth version: 3.0 2. Effective operating distance: 10 meters 3. Modulation method: GFSK 4. Working voltage: 3.0-4.2V 5. Working current: less than 2.5mA 6. Standby current: less than 0.3mA 7. Sleep current: less than 40 microamps 8. Charging current: greater than 200mA 9. Standby time: more than 100 days 10. Charging time: 3-4 hours 11. Lithium battery capacity: 200mAh 12. Sustainable working hours: 100 hours 13. Lithium battery life: 3 years 14. Button force: 80and-10g 15. Button life: 5 million clicks 16. Working temperature: -10-55 degrees Celsius 17. Charging interface: Type-C 18. Weight: 704g 19. Product size: 29x19.7x2cm