1. It is compatible with the functions of the traditional active buzzer and is synchronized with the driving of the flight control. 2. When the flight controller is normally connected, if the main battery is powered off during flight, it can still automatically emit a 100 decibel beeping sound after of power failure. 3. At the same time, the LED will emit a white light, and the sound is much louder than a normal buzzer. 4. Press the release button for more than 2 seconds to turn off the sound. 5.As long as it is connected to the buzzer interface of the flight controller, it can work. The buzzer has two modes of operation: 1. It is compatible with the functions of the traditional active buzzer and synchronized with the flight control. 2. When the flight control is normally connected, if the main battery in the flight is powered off, it can still automatically emit 100 dB of drip sound after of power failure, and the LED will emit white light, and the sound is louder than the general buzzer. Much bigger. How to turn off the buzzer: Press and hold the release button for more than 2 seconds, turns off the sound. The buzzer is compatible with all and 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 buzzer (the red LED will light to indicate that charging is in progress, Red LED off means charging is saturated; red light flashing means flight controller is powered off, wait waiting time). Colour:White+black Material:plastic Size:18x17x15MM Package Contents: 2 x Drone buzzer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.