ITEM NAME:2x 95DB Alarm DC 3 24V 12V 5V Electronic Buzzer Continuous Beep Piezoelectric HK Product Descriptions Color: Black Quantity: 2 Â pc Alarm Diameter: 22.5mm Alarm Height: 11mm 2 Mounting Holes distance: 30mm 2 Wires length: 100mm Buzzer Type: Piezoelectric Sound Pressure Level 95 dB Rate Voltage: 12V DC Operating Voltage: 3 - 24V Max Current Rating 10mA Frequency 3900Â ±500Hz Drive Method: Drive Circuit Built in Mounting Holes. Included: 2pcs.Buzzer Type: Piezoelectric. Alarm Height: 11mm.