Professor Motor 35 Ohm Resistor Controller - Includes 16 gage 42" PVC insulated wire harness with Banana Plugs. Features electronic self resetting circuit breaker to protect against accidental misconnect. This controller is NOT polarity sensitive - Recommended Applications : Stock or mildly tuned RTR Cars (1/32 Scalextric, Carrera, Ninco, Monogram, etc.), stock to moderate tuned HO Here is a review of the controller by Harry Wise from Home Racing World. PM 35 Ohm 1/32 Resistor Controller Review Easily upgraded with a rotary pot to provide adjustable variable braking performance Support For questions about controller operation or basic troubleshooting, contact Slot Car Corner for assistance. For problems that require more in-depth troubleshooting, repair or replacement, you will need to contact Professor Motor directly for assistance. For convenience, we have provided contact information below. email: [email protected] phone: (734) 316-2177