DICMIC Metal Hand Crank Siren Horn, Manual Handheld Air Raid Siren, Portable Loud Emergency Safety Siren, Red

Specification:
Sound Rating: 110±2dB(A) @1M
Frequency: 550±20Hz (Dependent on Rotation Speed)
Material: Aluminum Alloy
Weight: 2.65lb
[FIT FOR] Handheld alarm siren is used for factories, families, schools, flood control, disaster relief, public and industrial occasions.
[FUNCTION] 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.
[HIGH QUALITY] It is made of durable aluminum alloy that is sturdier and wear resistant.
[NOTE] This hand alarm can be warning timely to reduce the loss of people ‘s property and casualties.