Applicable models: compatible for compatible with Microsoft surfaceicrosoft surface pro8/X Bluetooth: imported Bluetooth chip Features: ABS chocolate key core, new electroplating pressing process, using PU leather, high-grade atmosphere. Features: Fn combined multimedia functions. Support protocol: Bluetooth 3.0/4.0/5.0 Connect the power supply through the Type-c interface for power supply Lithium battery capacity: backlight 450/250 Working ambient temperature: -10- +55° Charging time: 2-3 hours Use time: 95 hours Standby time: 60 days Button life: 500 million times Effective operating distance: 10 meters Use tutorial: After powering on, press FN+Z to activate Bluetooth, and when the blue light of the Bluetooth light appears and the red light starts to flash, it is searching for connection. Weight: 358 Size: 289*225*7 mm