... OEM/ODM ,china 4)RoHS Compatible Car Siren ES-309 Siren1) China Golden Factory Manufacture for Electronic Siren2) ... SPL: 120 dB Parameter Indication: Basic InformationItem ModelES-309 Brand Name CheBaoParameter SpecificationsOperating VoltageDC12v/24v optionalExtreme VoltageMin6vPower15w/20w ... boxcarton:52*24*47.5cm50PCS/0.06CBMPictures Showing:ES-309 Siren ES-309 alarm siren 120db,DC 12v,24v ,20w , ...