Feature: 1. Powerful Function: High strength controller can control the motor and obviously enhance the speed of the motor, effectively increasing the motor power. 2. Strong Power: The high power controller can improve efficiency and give your model a strong start and climbing power. 3. Stable Performance: ECU programmable controller protects the battery and extends battery life, as well as increasing the driving distance. 4. Perfect Match: Sine wave controller has stable effect and is not easy to fluctuate, which can be well matched with QS hub motor or QS medium drive motor. 5. Durable Material: Brushless controller is made of reliable ABS and metal, which is resistant to high temperature and can be used stably for a long time. Specification: Item Type: Programmable Brushless ControllerMaterial: ABS, MetalVoltage: 72V Bus Current: 200A Phase Current: 400A Undervoltage: 63V Waterproof Level: IP67 PC Programmable Support (with debugging software) Default Functions of the Controller: Hall plug, reversing, 0V low brake, throttle (0-5V), 12V high brake, ignition, single wire, Hall meter line, program port, three speed adjust, sport mode, parking, antitheft, charging regeneration, weak magnetic current EM series controller is sine wave type controller, which is weak magnetic brushless DC controller. Generally with QS motor is better, if you want to match the new motor, some parameters should be tested by yourself.. Package List: 1 x Controller3 x Wiring 5 x Screw Note: 1. Professional installation is highly recommended, our customer service has instructions and debugging software, if necessary, please contact customer service to request.2. Please read the manual carefully before installation, can be used with debugging software for adjustment.