Category:Hand Powered

While most sirens today are either electronic or electromechanical, this is not always feasible, especially in areas with a lack of available electricity. These areas may still need a way to warn the public of danger, so hand cranked sirens were created to fulfill this purpose. These sirens are usually a bare rotor and stator with a crank on the rear to operate the siren, very often with hand guards on the intake and stator ports to prevent injury, as well as with a stand to mount on a flat surface. These sirens are often portable, and use a gear mechanism which allows the rotor to spin much faster than the crank without injuring the operator. With electricity being so readily available today, hand-cranked sirens are typically relegated to poorer countries or very rural areas and are often sold by Chinese manufacturers.