Descriptions:Plastic housing, DC 3V-24V working voltage, black and red 2 wire, convenient for wiring.A great item for industrial use, DIY.Specifications:Product Name: Electronic BuzzerRated Voltage: DC 3V-24VOverall Size: 42mm x 16mm / 1.65 inch x 0.63 inch(D*H)Mounting Holes: 4mm/ 0.16 inchMounting Hole Distance: 50mm/ 2 inchCable Length: 24cm/ 9 inchExternal Material: ABSPackage Content:1 x Electronic Buzzer