The small thing that save your model! This buzzer prevents your drone or wing or plane or any other flying object you fly to be lost for ever for just a little more than 4 bucks and 2 grams of weight more on board.
It can be triggered by any switch on a free PWM channel on your RX or on a 5V/GND and B- on your FC.
It cries out loud at 90 dB (it hurts!) with 1W of power.
Features, instructions and SPECS: