Key Specifications/Special Features:Electric siren for all auto alarm .Power output: 15 to 20W .Rated voltage: 12V DC .Operating voltage: 9 to 15V DC .Operatign current: 600 to 1,200mA at 12V DC .Operatign temperature: -20 to 80 degrees Celsius .Sound pressure level: 110dB in 15W, 115dB in 20W .Plastic housing: ABS .