Protective Tablet Case for iPad Pro 12.9 inch (2015-2021) with Adjustable Stand and Detachable Bluetooth Keyboard 2-in-1 design combines a Bluetooth keyboard and leather protective case for your tablet Ultra-thin construction with fine workmanship, offering a simple and stylish look Bluetooth keyboard features a built-in rechargeable battery for convenient charging Converts into a supportive stand for hands-free viewing and browsing Slim and lightweight design ideal for travel, business trips, and daily use Specifications: Bluetooth version: 3.0 Effective operating distance: up to 10 meters Modulation method: GFSK Working voltage: 3.0 - 4.2V Working current: <2.5mA Standby current: <0.3mA Sleep current: <40uA Charging current: >200mA Standby time: >100 days Charging time: 3-4 hours Lithium battery capacity: 200mAh Sustainable working hours: up to 100 hours Lithium battery lifespan: approximately 3 years Button life: 5 million clicks Operating temperature: -10°C to 55°C Charging port: Type-C