Motor Type:Stepper Motor_x000D_ Voltage:48-72V_x000D_ Wattage:1500W_x000D_ Throttle :1.1-4.2V_x000D_ Undervoltage protection :41.5 Positive and negative 0.5V motor phase.Powerful start, climbing power large and small motor noise._x000D_ 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._x000D_ Automatically recognize the motor phase angle and motor right spin direction.It can be conducted by the Self-Study wires._x000D_ Start silently, balanced and constant power out-put, Production technical of Controller and authentic quality._x000D_ Over-heat protection, the controller will cut the power when the temperature is overtop, and restart if the temperature is normal._x000D_ Intelligent management of battery system, the controller will reasonable control the battery discharge, low-voltage protection function to extend the battery life._x000D_ 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._x000D_ Double-Mode, controller can check the motor hall sensor condition automatically._x000D_ If the motor sensors are broken, controller will operate to None-Hall mode._x000D_ When the motor phase is failure, controller will protect it, avoid motor burned, and protect the battery at the same time._x000D_ colour:Silver_x000D_ Material:metal_x000D_ Size:24 * 8.5cm Package Contents:_x000D_ 1* electric bicycle controller Only the above package content, other products are not included._x000D_ 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. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_