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# Buzzer
Cleanflight supports a buzzer which is used for the following purposes, and more:
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* Low Battery alarm (when battery monitoring enabled)
* Notification of calibration complete status.
* AUX operated beeping - useful for locating your aircraft after a crash.
* Failsafe status.
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Buzzer is enabled by default on platforms that have buzzer connections.
## Types of buzzer supported
The buzzers are enabled/disabled by simply enabling or disabling a GPIO output pin on the board.
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This means the buzzer must be able to generate its own tone simply by having power applied to it.
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Buzzers that need an analog or PWM signal do not work and will make clicking noises or no sound at all.
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Examples of a known-working buzzers.
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* [Hcm1205x Miniature Buzzer 5v ](http://www.rapidonline.com/Audio-Visual/Hcm1205x-Miniature-Buzzer-5v-35-0055 )
* [5V Electromagnetic Active Buzzer Continuous Beep ](http://www.banggood.com/10Pcs-5V-Electromagnetic-Active-Buzzer-Continuous-Beep-Continuously-p-943524.html )
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* [Radio Shack Model: 273-074 PC-BOARD 12VDC (3-16v) 70DB PIEZO BUZZER ](http://www.radioshack.com/pc-board-12vdc-70db-piezo-buzzer/2730074.html#.VIAtpzHF_Si )
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## Connections
### Naze32
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Connect a supported buzzer directly to the BUZZ pins. Observe polarity. Also if you are working with flight controller outside of a craft, on a bench for example, you need to supply 5 volts and ground to one of the ESC connections or the buzzer will not function.
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### CC3D
Buzzer support on the CC3D requires that a buzzer circuit be created to which the input is PA15.
PA15 is unused and not connected according to the CC3D Revision A schematic.
Connecting to PA15 requires careful soldering.
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See the [CC3D - buzzer circuit.pdf ](Wiring/CC3D - buzzer circuit.pdf ) for details.