Control Master 20 Power Center. High Power Train Controller. New in box.-Massive, controlled power available to fulfill the high demand requirements of sophisticated layouts.-Walkaround hand held control with memory. Unplug the controller from telephone jack, move to a new section, and the train continuesto run at the same speed as when it was unplugged.-High efficiency, advanced state of the art switching circuit technology.-Filtered and regulated DC output.-Unique push button braking control in hand held controller designed for left or right handed operators.-Mode switch for either large scale operation or for HO, N, and other DC operated trains.-Easy on terminals - no need for crimping or soldering.300 degree speed control of throttle allows three times the control arc of ordinary power packs.-LEDs (Light Emitting Diodes) for an overload indicator.-Main line direction switch for quick and easy reversing.-Circuit protector in case of overloads.-Master on-off switch.

excellent, new in box, appears to have never been opened