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A 27mm piezoelectric plate is a thin, circular sensor that generates voltage when mechanical pressure or vibration is applied. It is commonly used in sound pickups, knock sensors, and touch-sensitive applications. The plate is lightweight and can be integrated into musical instruments, electronic drums, and ultrasonic transducers. It can also function as a speaker or buzzer when an AC voltage is applied. The 27mm piezo plate has a high sensitivity to pressure and vibrations, making it ideal for industrial monitoring systems and scientific experiments.