Buy Universal FT-1089A bluetooth Keyboard for Microsoft Surface Pro3 Pro4 Pro5 Tablet Features: ABS chocolate core, PU voltage leather, atmosphere Function features: Fn combined multimedia function Application: For Microsoft Surface Pro3/Pro4/Pro5 tablet Power supply via USB interface Lithium battery capacity: 350mah Operating environment temperature: -10 -- +55° Charging time: 4-5 hours (the first charge should be fully charged for 8 hours) Use time: 100 hours Standby time: 120 days Key life: 500 million times Effective operating distance: 10 m Tutorial: 1. Turn ON the bluetooth keyboard case and push the switch from OFF to ON. At this moment, the keyboard of the case starts and the blue light displays for 3 seconds before turning OFF. 2. Then press [Link] / [connect] next to it, and the blue light will come on, and the bluetooth light will flash. 3. Open the tablet and find - Settings - turn on wireless and network - turn...