Fdh-400b Double Electric Siren 380V Motor Alarm Siren 165dB for Fire

Product Parameters

 Product Description
one.Define
  Alarms including hand alarm, electric alarm , each  place for emergency warning,  only hand alarm CZPT power support, powered by turning a crank issued a warning  signal effectively. Sound speed depends on the handle moved. Baffle the shutter  mechanism is set in the sound window, can select the sound intensity signal, quickly  closed the window, blocking, produce different signals.
2 . principle of working
Driven by turning a crank wheel at high speed, when the wheel turns, into the air  from the side of the tuyere wheel, high speed and high pressure to set the wheel on  absorption of air of resonance in the window of the base and at the same time.
three.Using range
Water conservancy, flood control, reservoir, civil defense, forces, fire control, prisons, mining, gas stations, ships, airport, plains, pasture, forest farms, factories, schools,  hotels, hotel and open barracks, the mountain rescue the enterprises and institutions,  etc.
four.Product features
Without the power support, compact structure, removable, light weight, easy to carry,  sound intensity can be adjusted and produce different signals, low frequency, wide  scope of application, etc

Hand operated siren  FDH-400B is created to provide efficient warning in purposes in which there is no energy provide.
Powered by rotation the manage,this product has a plate to shut off the seem when up to velocity providing it the capacity to produce diverse tones
Robust and compact,the siren can be very easily transported to distant locations and folds up to a modest measurement for simplicity of handling

Features : 
no energy source required 
strong and compact for portability 
potent reduced frequency seem
universally recognised signal 
Shutter system to give a selection of alerts:continuous and warble 

Software: 
Camp website,civil defence,mountain rescue,coast guard warning,quarries/mining