THE FEDERAL SIGNAL MODEL 52 RESONATING HORN PRODUCES 114DBA 10 FEET (124DBA 1M) WITH A 1000 FOOT RANGE. IT IS CAPABLE OF PENETRATING HIGH AMBIENT NOISE LEVELS BEING ELECTRICALLY-ACTIVATED THE MODEL 52 DOES NOT REQUIRE AN AIR COMPRESSOR FOR OPERATION THE MODEL 52 IS ABLE TO WITHSTAND THE SHOCKS VIBRATIONS DUST AND ATMOSPHERIC CONDITIONS ENCOUNTERED IN OFF-ROAD USE THE OPERATING TEMPERATURE RANGE IS -40 degreesF TO 185 degreesF (-40 degreesC TO 85 degreesC) RUBBER GASKETS AND A POWER CONNECTOR MAKE THE MODEL 52 COMPLETELY WATERTIGHT THE PROJECTOR AND INTERNAL PARTS ARE MADE OF ZINC-COATED STEEL OR STAINLESS STEEL TO RESIST CORROSION; THE EXTERIOR IS SEALED WITH GRAY ENAMEL PAINT THE HOUSING IS DIE-CAST ALUMINUM TIED AND ADHESIVE-BONDED INTERNAL WIRING HELPS PREVENT ELECTRICAL SHORTS WIRE BREAKAGE AND LOOSE CONNECTIONS THE MODEL 52 IS AVAILABLE IN 24VDC IT'S 18-32V OPERATING RANGE ALLOWS FOR VOLTAGE INCONSISTENCIES THE MODEL 52 HAS A DUTY CYCLE OF FIVE MINUTES ON AND FIVE MINUTES OFF FEDERAL SIGNAL'S MODEL 52 RESONATING HORN IS SPECIFICALLY DESIGNED FOR OFF-ROAD VEHICLES IT PROVIDES THE VERY LOUD SOUND FOR WHICH AN AIR-HORN IS USUALLY REQUIRED BUT WITHOUT THE NEED FOR AN EXPENSIVE COMPRESSOR USED BY MAJOR MANUFACTURERS OF CONSTRUCTION EQUIPMENT MODEL 52 RESONATING HORNS SUIT THE WARNING NEEDS OF ANY OFF-ROAD VEHICLE WORKING IN A HIGH NOISE ENVIRONMENT INCLUDING EXCAVATORS BACKHOES COMPACTORS (STEAMROLLERS) LOADERS TRACTORS BULLDOZERS TRENCHERS AND SCRAPERS 5 YEAR LIMITED WARRANTY.