SALE Safety Siren Hand Crank Siren No Power Required Manual Alarm for Emergencies
$87.84$92.46
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Manual Siren Hand-crank Operated Alarm Aluminum-Alloy Emergency Alarm for Public
$105.91
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About this item
By manually rotating the handle, the gearbox-of the transmission step by step acceleration to achieve the purpose of sound, the sound depends on the rotation-speed of the handle. Output Frequency: 550±20Hz.
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