horn speaker,siren speaker,alarm siren speaker power:15W , 20W ,25W Impedence:'4ohm 8 ohm 16ohm SPL.:120 dB Detailed Product Description1,Horn Speaker: HS-503 2 ... ,China Direct Supplier 3,Horn Speaker for Car Alarm/ Home Security System ... :120dB10,ODM/OEM Service 11,RoHS Best price,20W alarm siren speaker HS-503