... 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 ... )5,Rated Output Power:15w or 20w6,Impedance: 4 / 6 / 8 / 12 / 16 ohm 7,Magnet: Ferrite8, ... 11,RoHS Best price,20W alarm siren speaker HS-503