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 Keyboard Material: ABS Suitable for: for Microsoft Surface Pro 3/4/5/6/7 Bluetooth Version: 3.0 Bluetooth Transmission Space: 10m/393.7" (Approx..) Modulation Method: GFSK Working Voltage: 3.0-4.2V Working Current: Less than 2.5mA Standby Current: Less than 0.3mA Sleep Current: Less than 40uA Charging Current: More than 200mA Standby Time: More than 100 Days Charging Time: 2-3 Hours Battery Capacity: 350mAh (Included.) Working Hours: 35-100 Hours Battery Service Life: 3 Years Button Force: 80±10g Button Service Life: 5 Million Clicks Working Temperature: -10-55 Degree Celsius Features: Wireless, Portable, Heat Dissipation Size: 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 Keyboard 1 x Data Cable 1 x User Manual