The keyboard is ultra-thin and light which is easy to carry.It adopts bluetooth-compatible 3.0, which can provide fast and stable connection.It has the features of long standby time, strong magnetic adsorption, comfortable touch and heat dissipation.The four-corner baffle design provides protection for the display screen.Item Name: Wireless KeyboardMaterial: ABSSuitable for: for Microsoft Surface Pro 3/4/5/6/7Bluetooth Version: 3.0Bluetooth Transmission Space: 10m/393.7" (Approx..)Modulation Method: GFSKWorking Voltage: 3.0-4.2VWorking Current: Less than 2.5mAStandby Current: Less than 0.3mASleep Current: Less than 40uACharging Current: More than 200mAStandby Time: More than 100 DaysCharging Time: 2-3 HoursBattery Capacity: 350mAh (Included.)Working Hours: 35-100 HoursBattery Service Life: 3 YearsButton Force: 80±10gButton Service Life: 5 Million ClicksWorking Temperature: -10-55 Degree CelsiusFeatures: Wireless, Portable, Heat DissipationSize: 295mm x 220mm x 5mm/11.61" x 8.66" x 0.2" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Wireless Keyboard1 x Data Cable1 x User Manual