It's a 5v Voltage Buzzer. It is in small and neat sealed package. This voltage buzzer generally use in alarm circuit, communication equipment, piezo, Automobile electronics. This is in small , durable and easy to use. Good performance, general purpose piezo buzzer used commonly in alerting / alarming circuits. This is a PCB mountable buzzer that can be easily soldered to PCB board. Most commonly used in at 5v. Long life, stable performance, High Quality with SOT plastic package
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