uxcell DC 3V-24V 2-Wired Continuous Sound Electronic Alarm Buzzer Black Product Name : Electronic Buzzer;Model No. : SFM-27-1;Type : Continuous Sound Rated Voltage : DC 3-24V;Overall Size : 48 x 30 x 15mm / 1.9" x 1.2" x 0.6" (L*W*T) Mounting Hole Diameter : 3mm / 0.12";Wire Length : 10cm / 4" External Material : Plastic;Color : Black Weight : 9g;Package Content : 1 x Electronic Buzzer