Buzzer HNR-2512 12VPassive piezoelectric3-24V motor board Safety belt alarm prompt，High quality passive buzzer one diameter25mm ，height12mm。Tips：The product requires a technical control board to design sound，It is necessary to add drive to make the buzzer sound， It doesn't sound when directly connected to DC。The sound is a seat belt warning tone，“drop~drop~drop~”sound。

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