MRC tech 4 250
Yep i tried googling it also. the 250 is a discontinued item. (not sure why) i bought the system off ebay.
The Tech 4 250 looks pretty much like all MRC controllers and can be operated by the stationary unit. The 250, however, has an optional jack on the back of the machine to plug in the walkaround controller made especially for it. It works great (my only dislike with this one is the direction control is just a button and doesnt actually show which direction you are heading)
On the back of the unit you have 3 sets of terminals DC variable (this runs trains), AC accesories, and one marked DC (this one doesnt run trains). + the plug in jack. The manual that came with it can be found online, but as i stated it only says you can add additional jacks, doesnt say how.
Thanks
Charles Windom