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Manual Siren Hand-crank Operated Alarm Aluminum-Alloy Emergency Alarm for Public

Manual Siren Hand-crank Operated Alarm Aluminum-Alloy Emergency Alarm for Public

$105.91
  • Condition: New
  • Ships from: CN
  • Seller: 89yoyo_u (96.2% positive)
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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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