
I connected a AA battery storage case plastic box holder (2 x AA 1.5V battery) to power this module with 3 Volt. Besides power, a small speaker and a trigger (push button) you need a 360K resistor. (I used 470K as i could not find 360K in my stock and it also worked.) A small speaker can also be found on Aliexpress (~ 0,25 Euro).
The complete circuit without battery will cost less than a half euro.
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