Applicable model: Microsoft 12.2 inch surface pro3 or pro4 or pro2017 or pro6 or pro7 Product size: 295 x 220 x 5mm Packing size: 380 x 251 x 15mm Product weight: single gross weight 440g or net weight 280g Product model specifications: 1. Bluetooth 3.0 standard interface 2. Effective operating distance: 10 meters 3. Modulation mode: GFSK 4. Working voltage: 3.0-4 5. Working current: less than 2.5mA 6. Standby current: less than 0.3mA 7. Sleep current: less than 40uA 8. Charging current: greater than 200mA 9. Standby time: more than 100 days 10. Charging time: 2-3 hours 11. Lithium battery capacity: 350mAh or 550mAh (backlit) 12. Sustainable working hours: 35-100 hours 13. Lithium battery life: 3 years 14. Button force: 80 10g 15. Key life: 5 million clicks 16. Operating temperature: -10 - 55 Bluetooth enable steps: 1. Turn on the Bluetooth switch on the tablet. 2. Long press the power switch on the keyboard, and the power light will flash. 3. "Bluetooth Keyboard" and four numbers will be displayed on the tablet screen. 4. Corresponding to the prompt on the tablet screen, enter four numbers. 5. Successfully connected to the wireless keyboard. Status display LED 1. Switch machine and Bluetooth connection indicator light: After pressing for three seconds, the indicator light flashes, the keyboard enters the Bluetooth pairing mode, and it will automatically go out after the connection is successful. 2. Case status indicator: The light is on when the keyboard is in uppercase input state 3. Charging indicator 4. Weak current prompt indicator light: When the voltage is lower than 3.2V, the indicator light flashes, prompting that a charging cable needs to be connected for charging. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.