Descriptions:Plastic housing, 3V working voltage, 2 terminals, convenient for wiring.A great item for industrial use.Specifications:Product Name: Electronic BuzzerRated Voltage: 3VSound Pressure: 80dBResonant Frequency: 2.7KHzImpedance: 16 ohm+/-20%Size: 9.5mm x 5.5mm/ 0.37 inch x 0.22 inch(D*H)Terminal Length: 5.5mm/ 0.22 inchExternal Material: ABSColor: BlackPackage Content:10 Pcs x Electronic Buzzer