The SUNGOOYUE Brushless Motor Controller is a high-quality component designed for electric bicycles, specifically compatible with MTB bikes. It features 3 modes for customizable speed control and is suitable for bikes with a voltage range of 24V to 48V and a maximum current of 17A. Made of durable materials like aluminum, aluminum alloy, and steel, this controller also comes with a 2-year manufacturer warranty for added peace of mind. Ideal for universal and E-Cross bikes, this brushless DC motor controller is a reliable choice for enhancing your cycling experience.BOX HAS BEEN OPENED BUT PART HAS NOT BEEN USED STILL NEW