The business style leather case is made of high-quality material Fine workmanship, equipped with 7-color backlit keys for convenient nighttime use Features a pen slot for secure storage to help prevent loss of stylus or pen Includes a Bluetooth keyboard version 3.0, upward compatible with Bluetooth 5.1 devices Keyboard is detachable from the case; strong magnetic attachment ensures stability Bluetooth keyboard features a high-speed chip for quick pairing with devices within seconds Charges via Micro USB cable; portable and convenient for use on the go when fully charged Specifications: Battery material: lithium-polymer battery Bluetooth: BT 3.0 (upward compatible with 3.0/4.0/5.0/5.1) Effective distance: 10 meters Standby time: 100 days Continuous working time: not less than 30 hours Charging time: 23 hours Lithium battery capacity: 280mAh Battery lifespan: up to 2 years Button lifespan: 3 million clicks Modulation method: GFSK Operating voltage: 3.04.2V Operating current: 48mA Standby current: low power consumption