horn speaker,siren speaker,alarm siren speaker power:15W , 20W ,25W Impedence:'4ohm 8 ohm ... Supplier 3,Horn Speaker for Car Alarm/ Home Security System /outdoor/indoor4,Size:125mm(Diameter)*118mm(Length)5,Rated Output Power:15w or ... .4mm9,Sound Pressure Level:120dB10,ODM/OEM Service 11,RoHS Best price,20W alarm siren speaker HS-503