YASONG 110dB Hand Crank Siren, Manual Portable Emergency Alarm Horn, No Power Required, Red or Green Color:Red 2 flashing modes including strobe

2 flashing modes including strobe flash and burst flash

and the siren can be set to light-only

industrial sites and networked warning systems

Magnet base or bolted base options for different installation needs

geological disaster warning areas and industrial security systems

YASONG 110dB Hand Crank Siren, Manual Portable Emergency Alarm Horn, No Power Required, Red or Green Color:Red 2 flashing modes including strobeThe YASONG hand crank siren is a manual emergency warning horn designed for locations where power supply may not be available. It is suitable for factories, homes, schools, warehouses, flood control areas and temporary emergency warning use. This model works by hand operated cranking, so it does not require wiring, batteries or charging. The faster the handle is cranked, the louder the siren sound becomes. Manual hand crank operation with no power