This vintage Throttlepack Model 501 is a limited edition unit that is perfect for controlling your HO train railroad. The throttlepack is made of metal and has a copper color, with a 100 W power type and a voltage of 120V. The control system is analog and compatible with DCC, while the scale is 1:5 and the gauge is HO. The item length is 7 inches, while the item width is 6.5 inches, and it weighs 3 lbs. The year manufactured is 1970, and the brand is MRC. This unit is a great addition to any model railroad enthusiast's collection, and it comes with features that make it stand out.