Description
The siren with manual operation is used for emergency warning and easy to carry.
Handheld alarm siren is used for factories, families, schools, flood control, disaster relief, public and industrial occasions.
By manually rotating the handle, the transmission step by step acceleration to achieve the purpose of sound, the sound depends on the rotation speed of the handle.
This hand alarm can be warning timely to reduce the loss of people ‘s property and casualties.
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