ITEM NAME:DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer A4F2 DC 3-24V 110dB Industrial Electronic Continuous Sound Buzzer A4F2 Product Name : Electronic Alarm Buzzer; Sound-making Type : Continuous Sound Rated Voltage : DC 3-24V; Sound Pressure : 110dB Overall Size : 43 x 40mm / 1.7" x 1.6" (D*T) Thread Diameter : 3mm / 0.12";Mounting Hole Distance : 33mm / 1.3" External Material : Plastic Package Content : 1 x Electronic Alarm Buzzer Color : Black Weight : 35g Plastic housing, DC 3-24V working voltage, 2 screw terminals, convenient for connecting. An ideal item for industrial use. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.