✔︎【Portable and Easy to Use】- The Lfhelper Hand Crank Alarm is designed for ease of use anywhere. Compact and lightweight, it requires no tools for installation, taking up just 0.15 square meters. Perfect for one-person operation, it’s ideal for emergency situations where power is unavailable. ✔︎【Reliable Manual Operation】- With its manual hand lever operation, this alarm is independent of power sources, ensuring dependable performance even during power outages or in remote areas. Simply crank the handle clockwise at a consistent speed (50-80 RPM) to emit a powerful sound, making it effective in various emergency scenarios. ✔︎【Robust Construction】- Crafted from durable aluminum alloy, the Lfhelper Hand Crank Alarm is built to withstand tough conditions. Its sturdy design ensures longevity and reliability, making it suitable for both indoor and outdoor use. ✔︎【Loud and Effective Warning】- Emitting a powerful 110 dB sound at a frequency of 550 Hz, this alarm grabs attention with its loud, penetrating tone. Its wide transmission range of up to 1000 meters ensures that the alarm is heard and acted upon quickly in emergencies. ✔︎【Versatile Applications】- From factories to schools, military camps to airports, the Lfhelper Hand Crank Alarm is indispensable. It ensures safety in diverse environments such as ships, mines, gas stations, and hotels. Its broad applicability makes it a must-have for emergency preparedness., Weight: 4.40924524 Pounds, Manufacturer: Lfhelper