Product DescriptionModel FMT 30D, this item came to us along with a group of 1950s era Civil Defense equipment which was in storage locally. Internal vacuum tubes, with a Pioneer Gen-E-Motor Dynamotor, 5.6 volt, 29 amp input. 600 volt, 170 amp output. Also stenciled internally on one end "U.S. PROP./W-ORD-482/X8946". These transmitters were also used in 1940-1950 era Police cars, mounted inside the trunk. Appears complete, dirty from storage. Item weighs 34 lbs.