This is a very siren and if two or more piezo's are located in a room, the burglar does not know where the sound is coming from, A robber will not stay anywhere with an ear-piercing sound as he cannot hear if someone is approaching, It's the best deterrent you can get. The "F" contact on the piezo is "feedback" and is not needed in this 555 timer circuits.
Hello, my name is Jack Sparrow. I'm a 50 year old self-employed Pirate from the Caribbean.
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