2-in-1 design, it is not only a Bluetooth keyboard protector but also a tablet case The Bluetooth 3.0 keyboard has a long-lasting button life, durable to use The keyboard has a built-in lithium battery, convenient to charge and use Can be converted to a supporting stand for hands-free movie watching and web surfing Strong magnetic absorption at keyboard position, and the keyboard won't move easily Slim and lightweight design, convenient for travel, business trip, etc. Specifications: Bluetooth: 3.0 standard Effective distance: 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: 150mAh Sustainable working hours: 100 hours Lithium battery life: 3 years Button force: 80±10g Button life: 5 million clicks Operating temperature: -10°C~55°C