... horn speaker,indoor speaker,outdoor speaker,loud speaker power:10W~20W Impedence:4,8,16ohm SPL:120 waterproof Product Description1,Waterproof Horn Speaker: HS ... -503 2,China Direct Supplier 3,Horn Speaker for Car Alarm/ Home Security ... Coil:25.4mm9,Sound Pressure Level:120dB10,ODM/OEM Service 11,RoHS hot sale10w indoor speaker HS-503,China