Descriptions:Plastic housing, 1.5V working voltage, 2 terminals, convenient for wiring.A great item for industrial use.Specifications:Product Name: Electronic BuzzerRated Voltage: 1.5VSound Pressure: 80dBResonant Frequency: 2KHzImpedance: 16 ohm+/-20%Size: 12mm x 9.8mm/ 0.47 inch x 0.38 inch(D*H)Terminal Length: 5.5mm/ 0.22 inchExternal Material: ABSColor: BlackPackage Content:5 Pcs x Electronic Buzzer