Item Type: DC Motor Speed Controller Material: Aluminum alloy Voltage: 37V Power: 800W [BRUSH CONTROLLER] The brush controller has a voltage of 36V and a rated power of 800W, with stable and reliable performance. [ALUMINUM ALLOY] The brushed controller is made of aluminum alloy with recesses to ensure the internal circuitry is protected from thermal overload due to good heat dissipation. [PROTECTIVE FUNCTION] The brush controller features under voltage protection, over current protection, and stall protection to ensure safe operation of the electric bike. [EXCELLENT PERFORMANCE] Brushed motor controllers provide stable speed control and responsive braking and direction changes. [EASY WIRING] The wiring method for the brush motor controller is simple; just follow the wiring labels for quick and convenient installation. 1 x DC Motor Speed Controller