Professor Motor "Carrera Home Set PRO" Model Electronic Slot Racing Controller - Recommended Operating Voltage Range : 14 to 19 volts - NEGATIVE polarity - Includes variable sensitivity (single knob adjust), 25 Ohm variable brakes, internal aluminum heat sink, Heavy gage silicone insulated 13 gage leads & Carrera terminals - New "Platinum Series" transistor based technology - Recommended Applications : 1/32 & 1/24 Carrera home and club track racing through heavily  modified Motors to JK Falcon