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The SW420T vibration buzzer sensor detects vibrations and shakes using a spring-loaded switch mechanism. When vibration is detected, the sensor outputs a digital signal, triggering an alarm or buzzer. The module is commonly used in security systems, earthquake detection, and industrial automation. It operates at 3.3V to 5V and features an adjustable sensitivity level. The built-in buzzer provides an audible alert when vibrations are detected. The sensor is compact and easy to integrate with microcontrollers. It is ideal for anti-theft alarms, motion detection, and safety monitoring applications.