Motor Type:Stepper Motor Voltage:48-72V Wattage:1500W Throttle :1.1-4.2V Undervoltage protection :41.5 Positive and negative 0.5V motor phase.Powerful start, climbing power and small motor noise. When the battery voltage become lower, the current will also become lower to keep normal running.It not only protect the battery and extend the battery life, but also increase the running distance. Automatically recognize the motor phase angle and motor right spin direction.It can be conducted by the Self-Study wires. Start silently, balanced and constant power out-put, Production technical of Controller and authentic quality. Over-heat protection, the controller will cut the power when the temperature is overtop, and restart if the temperature is normal. Intelligent management of battery system, the controller will reasonable control the battery discharge, low-voltage protection function to extend the battery life. When overload of the bike to make the motor stall more than 2 seconds, the controller will cut off the current out-put to protect the motor and battery. Double-Mode, controller can check the motor hall sensor condition automatically. If the motor sensors are broken, controller will operate to None-Hall mode. When the motor phase is failure, controller will protect it, avoid motor burned, and protect the battery at the same time. colour:Silver Material:metal Size:24 * 8.5cm Package Contents: 1* electric bicycle controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.