A practical BluetoothLE scanning tool that can connect to BLE Bluetooth devices to obtain information, supports terminal mode, and can set function keys. It is a very convenient tool for developers of Arduino or Raspberry pie. Support the reminder function of Bluetooth device [online]. When the stored Bluetooth device is scanned, a reminder will appear. The distance can be judged by the value of rssi. If there is a Bluetooth headset forgotten where to put it, you can use this function to find . There is also an interesting application method for this function. For example, put the Bluetooth headset in the suitcase when going abroad. When the suitcase turntable sends the luggage out, the mobile phone will remind the user that the luggage is here!