200watt,8ohm waterproof driver unit for siren/alarm electronic system loudspeaker driver high power alarm loud speaker We were founded in 1998, ... specialized in manufacturing many kinds of loudspeakers, horn speakers, driver units, alarming horns, reflex horns, high-power speakers ,column/wall ... )sound pressure level130(dB) TD-200A horn/loudspeaker siren/alarm driver unit