The normal air raid signal is typically a 3 to 5-minute wavering, rising and falling, or "wail" tone. This signal indicates an imminent attack or severe emergency requiring immediate shelter. It is different from a steady alert tone used for weather or a steady "all-clear" signal.Air Raid Siren Characteristic...[Detailed]

‌Advantage‌ of Electric Siren : 1.Simple structure2.Strong anti-interference capability3.stable operation in extreme electromagnetic environments[Detailed]

Introducing Our Rescue Air Cushions: Your Reliable Ally in High-Rise Rescue OperationsWhen every second counts in high-rise emergencies, our Rescue Air Cushions are engineered to deliver unmatched performance and peace of mind.Crafted with ‌tear-resistant material‌, these cushions are built to withstand the rig...[Detailed]

1. Model. The model of the exhaust fan is basically formulated by the state. Generally, as long as the model is known, the problem is basically solved by half; 2. Is it high temperature? Some places are necessary to prevent high temperatures, especially high-temperature gases. At this time, we choose fire-fighting fans, and w...[Detailed]