Protective Tablet Case for iPad Pro 12.9 2015 2021 Adjustable Stand Detachable Bluetooth Keyboard 2-in-1 design, Bluetooth keyboard leather protective case for your tablet Ultra-thin, fine workmanship, simple and stylish The Bluetooth keyboard has built-in the rechargeable battery, convenient to charge Can be converted to a supporting stand for hands-free movie watching and web surfing Slim and lightweight design, convenient for travel, business trip, etc. Specifications Bluetooth version 3.0 Effective operating distance 10 meters Modulation method GFSK Working voltage 3.0-4.2V Working current lt2.5mA Standby current lt0.3mA Sleep current lt40uA Charging current gt200mA Standby time gt100 days Charging time 3-4 hours Lithium battery capacity 200mAh Sustainable working hours 100 hours Lithium battery life 3 years Button life 5 million clicks Operating temperature -10deg - 55deg Charging port Type C