Feature: 1. Enhanced Motor Control: The electric motor controller could effectively manages motor performance, speed, and effectively increasing motor power. 2. Premium Material Construction: This brushless DC motor controller is made of solid materials resistant to high temperatures, ensuring long time stable use. 3. Stable Sine Wave Control: The electric motor controller features stable sine wave control, limiting susceptibility to fluctuations, perfect match with for QS hub motors or for QS mid drive motors. 4. Fine Workmanship: The controller is professionally manufactured with meticulous workmanship, boasting a unique design that ensures stable performance and high reliability. 5. Battery Safeguard and Enhance Longevity: The controller is designed to protect the battery and extend its life, additionally, enhances driving distance. 6. Self Learning Function: This brushless DC controller comes with a self learning function, making it versatile and adaptable to different motor settings. Specification: Item Type: Brushless DC Motor Controller Material: Metal, ABS Model: DK72550T Voltage: 72v default (36-100V) Bus Current: 180/280A Phase Current: 550A Speed: Approx. 130km/h (The exact speed needs to be combined with the weight of the vehicle and wind resistance) BT: Built in Fitment: Fits for QS Motor Electric motorcycle mobility scooter≤8000W. Package List: 1 x Motor 1 x Terminal Cover 1 x Wiring 5 x Screw Note: Installation by a professional mechanic is highly recommended