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DC2 to 12V Alarm Siren with 3.5mm Plug Connector 120dB@12VDC, it's loud even at 3V or 5VDC Plug connector inner is anode,out is cathode or cut off,

2V 3V 5V 6V 9V 12V DC Piezo Electronic Buzzer Very Load Alarm Electric Security Siren Horn 120dB@12VDC

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Dc12V 120Db Loud Wired Horn Siren Sound Home Alarm System Indoor

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1 piece 120dB alarm Electronic Buzzer 9v 12V Tone Siren Horn