Set of 5 Aircraft Finder Buzzers for Radio Control Models Thank you for viewing. This electronic buzzer helps locate your model aircraft when it crashes in grass, bushes, or other areas. To install, connect it between a servo and the receiver. It will sound at 85dB one minute after losing the signal, helping you find your aircraft. After another minute, the beeping interval shortens, and the sound continues. Operating voltage: 4-6V, lead wire length: 80mm.