how to make a buzzer

...piezo transducer). Piezo is an electronic device commonly used to produce sound. Light weight, simple construction and low price it usa...

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... time for a task or activity. or alarm: The or alarm function is used to signal the end of the set time period. The or alarm s...

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... technology, which the system easily installed. It doesn't need wires. Just put the caller which is power by battery on the table that is OK....

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