If the device is on Android 6 and above, you need to enable Location Permission. To do so,
Go to Settings -> Applications -> Qlipp Tennis -> Permissions -> Location Permission set to YES.
Make sure that your location service is also switched on. This is because we are using Bluetooth Low Energy(BLE) to connect to the sensor and Coarse Location Permission is required. However, please be assured that location information is not accessed by our app.