You are bidding on a (believed to be new/unused) Watchman I by Depotronics, Inc. It is a solid state unit designed to replace a #153C contractor. For use with Lionel track-side accessories such as: signal bridges, dwarf signals, crossing gates, all solenoid driven accessories, etc. Provides two powered output circuits. Activated from an insulated rail trace & can be powered from either a fixed/variable voltage transformer or track voltage.