Type:Emergency Signal Warning
Signal Transmission:Hand Crank Operation
hand operated siren don't need power supply and powered by rotating the handle
hand operated siren has a plate to shut off the sound once up to speed giving it the ability to produce different tones
hand operated siren is used to provide emergency population warning of approaching danger and sometimes to indicate when the danger has passed. Some are also used to call the volunteer fire department to go fight a fire.
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