72V 200A ECU Programmable Brushless DC Controller High Power Sine Wave Controller for Electric Scooter Bicycle Motorcycle Item Type: Programmable Brushless Controller Material: ABS, Metal Voltage: 72V Bus Current: 200A Phase Current: 400A Undervoltage: 63V Water Proof 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.