... :100dBmaterial:ALUM electronic siren for Ship and boat, electronic siren; Car Amplifiers;Horn Speaker;Alarm Speaker ,,Horn Speaker, Loudspeaker,driver unit,alarm speakerAlarm Speaker;Warning Light ... unit speaker;tweeter speakerPa-horn speaker ;PA speakerWarning light, siren & alarm speaker. YHC5-1 (MARINE SPEAKER)Horn Speaker & loudspeaker for electronic siren for Ship and boat, electronic siren