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runordie21/01/2019
Cheap and easy to install. The longer pin is the positive.
The buzzer is not self-powered (will not work if the battery is unplugged in a crash), and not very loud. But does the job in most cases.
I used a pair of spare-wires (cut off the ESCs) to plug the buzzer on the FC. Attached it with a zip tie and some piece of foam tape on the frame.
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