Professor Motor "Commercial Track Basic" Model Electronic Slot Racing Controller -  (Replaces PMTR2058) - Recommended Operating Voltage Range : 12 to 15 volts - POSITIVE polarity - Includes internal aluminum heat sink, heavy 13 gage silicone leads & solid copper alligator clips w/boots - Higher sensitivity for large commercial type tracks - New "Platinum Series" transistor based technology - Recommended Applications : 1/24 commercial track racing through JK Falcon & 16D Motors