Skin Touch Leather Case for iPad Air 2/Air (2013)/iPad 9.7-inch (2018) (2017) Bluetooth-compatible Keyboard Stand Cover - Black Multi-System CompatibilitySupports iOS,Android,and Windows systems. Easily switch between systems by pressing Fn and corresponding keys (QWE). Full Shortcut KeysCustomized hot keys for iPads provide efficient operation,enhancing productivity and user experience. Long-lasting BatteryPowerful 150mAh lithium polymer battery offers over 80 hours of continuous work and 100 days of standby time on a single 2-3 hour charge. Energy-Saving DesignAutomatically enters sleep mode after 15 minutes of inactivity,easily awakened by pressing any key. Durable ConstructionPU leather cover with magnetic buckle and non-slip rubber lining provides comprehensive protection and stable multi-angle support for iPad. Comfortable TypingMechanical scissors keyboard design ensures quick rebound and smooth key presses for a superior typing experience. Specifications: Battery type: lithium polymer battery Bluetooth-compatible version: 3.0 (upward compatible with 3.0/4.0/5.0/5.1 Bluetooth-compatible devices) Effective distance: 10 meters Standby time: 100 days Continuous working time: not less than 80 hours Charging time: 2-3 hours Lithium battery capacity: 150mAh Lithium battery life: 2 years Key life: 3 million clicks Modulation mode: GFSK Working voltage: 3.0-4.2V Working current: 4-8mA Standby current: