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By certification 
The manual emergency siren LK-100A is a base mount hand crank siren which does not require power supply, and can provide an effective alarm in places without power support. You only need to manually shake the handle clockwise by hand to achieve the ideal alarm effect.
| Sound Rating: |
| 110±2dB(A) @1M |
| Output Frequency: |
| 550±20Hz |
| Single Tone |
| Net Weight: |
| 1.2Kg |
| Carton Size: |
| 15.5x15.5x16CM |
http://www.lkrescue.com/
