How to turn off the buzzer
1.Press and hold the release button for more than 2 seconds, the
JHE42B Finder turns off the sound.
2.The JHE42B Finder is compatible with all BF and CF flight controls.
Just connect to the buzzer interface of the flight controller and it
will work. When the flight control wiring is correct, the multi-rotor
aircraft is powered on, and the flight control power supply will
automatically charge the JHE42B Finder (the red LED will light to
indicate that charging is in progress).