Manual Siren Loud 110dB Alert Penetrating Sound Hand Crank Siren For Public Safety Crowds Control Emergencies

Wear resistant structure: Crafted from aluminum. Compose of a handle and internal mechanical device, it emit a high-frequency alarm when the handle rotates rapidly, effectively attracting attention in emergency situations. Small size and portable: easy to carry and operate, providing effective warnings in emergency situations, and extremely practical even in the absence of power. Adjustable volumes: The volumes can be adjusted according to the speed of the handle rotation. The faster the speed, the louder the sound, and can be opened to far enhances the sound effect. Manual Siren Loud 110dB Alert Penetrating Sound Hand Crank Siren For Public Safety Crowds Control Emergencies. Features: Wear resistant structure: Crafted from aluminum. Compose of a handle and internal mechanical device, it emit a high-frequency alarm when the handle rotates rapidly, effectively attracting attention in emergency situations. Small size and portable: easy to carry and operate, providing effective warnings i