Alarm Siren Specifications: Model: ADX525B Voice Coil Impedance:6/8/12Ohm Voice coil Dimension(Dia):¢25.6mm Rated Voltage:12VDC Operating Voltage:9 16VDC Output Power:15W/20W/25W Min. S.P.L 105/108/110dB(at rated voltage at 1m) Max.Rated current:550/1000/1200mA Tone Nature:warble/1-Tone/6-Tone Operating Temperature:-20+60°c Weight:439±10g This siren is usedwhen someone wants to cut off wire to shut down the power, once triggered ,it will send out clear buzzer to remind theowner alarm. Very applicable to something highly-valued Small size making it not easy to detect. Back upbatteries inside,able toget charged for nearly 500 times. Good quality and highly praised by customers Being widely used in different situations