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Specialist in Multirotor Tech & FPV Equipment

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PWM Signal Loss Alarm & RC Lost Model Discovery Buzzer

PWM Signal Loss Alarm & RC Lost Model Discovery Buzzer



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A lost model buzzer is a must have accessory for any drone pilot. We've all seen the YouTube videos where a multirotor crashes into a field of long crop, never to be seen again. Well this little RC buzzer could be the savior; think of it like a SOS beacon for your drone. It’s super loud and will guide you right to the aircraft. The buzzer will sound after 60 seconds if your radio control signal is lost. It will also sound if your control sticks are inactive for more than 60 seconds. To fit the buzzer, use it like a servo extension lead; simply connect it between your throttle channel (best for drones) or main servo and your receiver.

Please note this buzzer is not directly compatible with flight control boards like the naze32, they work with 5V Piezo type buzzer, like this


  • Loud >85dB alarm to guide you to your model.
  • Can be used as a reminder to turn off the R/C receiver - will sound after 60 seconds of inactivity.
  • Plugs into any standard 4.8 - 6.0 V DC powered receiver.
  • Small size and weight (~7-grams).

Setup Instructions:

Connect the alarm between a servo / throttle channel and your PWM receiver.

To test if it is functioning: Do not move any of the control stick on the transmitter for 1 min or simply turn it off. You will hear a continuous beep sound after 1 minute. If you ignore the continuous beep sound for around 2 minutes, the beep sound will change to a louder sound. It will stop once you move the control stick or power off the receiver

Fail Safe Buzzer Lost Model Alarm

  • Alert Level: 85dB
  • Operating Voltage(v): 4-6 votls DC
  • Current Consumption:< 35 mA (Working mode) < 2.5 mA (Non-working mode)
  • Weight:7g
  • Size: 17x13x10mm


  • 1x Signal Loss Alarm & RC Lost Model Discovery Buzzer

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Sorry, we don't currently have any product related advice for this item. For general tips, tutorials and help please check out our Multirotor Beginner's Guide. Alternatively feel free to ask us a question.

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COVID-19: We are still shipping out orders daily, but have changed our same day shipping cut-off time to 1PM to help cope with demand. If an order is placed after 1PM we will still do our best to ship same day as our daily postal collection is around 4:15.

Please be aware that deliveries with Royal Mail are taking longer to get through. At the moment we are finding it can range from next day to even up to two weeks, with 3-5 days being typical. So if you choose Royal Mail as a shipping method please be patient, shipments aren’t going missing they are just taking a while to get through the postal service. For fast deliveries we recommend choosing DHL.

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