Hand Crank Siren Horn Portable Manual Loud Emergency Alarm for Factory School

Key Points

• STURDY METAL STRUCTURE: Aluminum alloy body with corrosion‑resistant finish for long service life.
• MANUAL OPERATION: Generates alarm by turning handle; louder sound with faster rotation speed.
• ADJUSTABLE SOUND OUTPUT: Achieves up to 110 dB at 150 rpm, effective range about 1 km under open field conditions.
• EASY TO CARRY: Compact size and handle design allow quick response in outdoor or power‑off situations.
• MULTI‑PURPOSE USAGE: Ideal for emergency drills, factory signals, flood control or temporary alert duty.