This buzzer is used with Pixhawk and PX4 autopilot to annunciate status tones. The buzzer includes a two-position DF14 connector on one side that plugs directly into the Pixhawk or PX4 FMU board. The Passive buzzer has a JST-SH connector on one side that plugs directly into the Pixhawk. Once connected you will be able to hear different sounds that relate to different modes!
Note : Pixhawk buzzer comes with two types as shown in images you will received random.