The leather case is made of skin-friendly PU material, and the back is made of flexible TPU The TPU case adopts the honeycomb design, which can effectively heat dissipation With a pen slot for storage, you are not afraid of losing your pencils Comes with Bluetooth keyboard 3.0, upward compatible with 5.1 Bluetooth devices The Bluetooth keyboard adopts a high-speed chip, which can connect to Bluetooth devices in seconds It is charged with the Micro USB cable, and it can be freely carried and used when fully charged Specifications Battery material lithium-polymer battery Bluetooth BT 3.0 upward compatible with 3.04.05.05.1 Bluetooth devices Effective distance 10 meters Standby time 100 days Working hours not less than 100 hours Charging time 2-3 hours Lithium battery capacity 280mAh Lithium battery life 2 years Button life 3 million clicks Modulation method GFSK Working voltage 3.0-4.2V Working current 14-17mA Standby current lt0.3mA Sleep current lt40uA Charging current 100mA Charging method Micro USB cable charging