YASONG 110dB Hand Crank Siren, Manual Portable Emergency Alarm Horn, No Power Required, Red or Green Color:Red cranes and outdoor emergency warning

cranes and outdoor emergency warning areas

0–8m remote control distance listed on the product page

tone and flashing mode are not adjustable

USB voice update for configurable warning audio

wiring method and installation environment before ordering

YASONG 110dB Hand Crank Siren, Manual Portable Emergency Alarm Horn, No Power Required, Red or Green Color:Red cranes and outdoor emergency warningThe 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