Siren Manual Hand Big China

The Hand Operated Manual Siren is a dependable, high-output warning device designed for emergency situations where electricity is unavailable. Engineered for civil defense, rescue missions, disaster preparedness, and remote operations, this manually powered siren produces a strong 118 ±2 dB(A) sound level at 1 meter, ensuring alerts are clearly heard across wide areas. With an effective sound range of up to 500 meters radius, it provides reliable signaling for evacuation and emergency coordination. The siren operates entirely without electrical power, making it ideal for power outages and off-grid environments. It features adjustable output frequency (600 ±20 Hz depending on rotation speed) and offers both continuous and warble sound modes via a shutter mechanism for versatile signaling. Built with durable construction and designed for flat surface or wall mounting, this manual siren is a practical and essential safety tool for critical alerting needs.