ST830S Bluetooth 3.0 Fine Wool Texture PU Leather ABS Detachable Seven-color Backlight Bluetooth Keyboard Leather Tablet Case for Samsung Galaxy Tab S4 10.5 inch T830 T835, with Pen Slot & Holder Features: 1. Accurately fit the corners of the equipment. 2. Precise cutting for easy access to all buttons and ports for smooth operation. 3. Easy to insert and remove. 4. Applicable to Samsung Galaxy Tab S4 10.5 inch T830 T835. 5. Does not include a tablet. Specifications: 1. Product size: 255x174x22mm. 2. Net weight of the product: 600g. 3. Material: outer skin fine sheep grain PU material, ABS plastic keyboard. 4. Bluetooth: 3.0. 5. Effective operating distance: 10 meters. 6. Modulation method: GFSK. 7. Working voltage: 3.0-4.2V. 8. Working current: less than 2.5mA. 9. Standby current: less than 0.3mA. 10. Sleep current: less than 40 microamps. 11. Charging current: greater than 200mA. 12. Standby time: more than 100 days. 13. Charging time: 3-4 hours. 14. Lithium battery capacity: 480mAh. 15. Sustainable working hours: When the backlight is not turned on, it is longer than 100 hours (the backlight is turned on for 5 hours). 16. Lithium battery life: 3 years. 17. Button force: 70-90g. 18. Key life: 5 million clicks. 19. Operating temperature: -10-55 degrees Celsius.