Marine Speaker and Electric siren/ Megaphone 300W .
These products have high power output with computer chip device, compare favourably with hooter,and Use conveniently.
(3)Function: loud speaking, shout, whistle;
(4)Panel botton: Power switch,handheld speaker insert(speaking); siren botton; clear botton;light dimmer botton,six degree botton.[bottom-up]
Application: 200 tons to 1 million tons ships.
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