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By certification 
As it is a hand-cranked siren, the primary speed of the hand-cranked siren determines the sound effect of the siren. Rotation speed is directly proportional to sound effect. Relatively speaking, the higher the speed, the louder the sound. There is a difference between people shaking the alarm. People's height, strength, shaking speed, etc. are all direct factors that affect the sound effect of the siren, so we have made a macro regulation here, the primary speed of shaking cannot be less than 90r/min, otherwise it will not reach the expected sound effect.
| Sound Rating: |
| 110±2dB(A) @1M |
| Output Frequency: |
| 550±20Hz |
| Single Tone |
| Net Weight: |
| 1.72Kg |
| Carton Size: |
| 15.5x15.5x30CM |
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