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Works well with airplanes, helicopters, drones and special projects. To initiate the tone, simply turn off your transmitter and within a few seconds, the alarm will activate. The tone will also sound if the channel it is attached to has no activity after approx 60 seconds. The tone will stop as soon as it detects channel activity. Can also work well if you just want an alarm to let you know when you accidentally left your vehicle or aircraft power on.