Description: 【Compatibility】: The Controller is suitable for BBS01B, BBS02B, BBS03, and BBSHD mid drive motors. It's designed to work seamlessly with these models for optimal performance. 【Specifications】: This controller operates at a working voltage of 36V and has a rated power of 250W. Please ensure that the voltage and wattage of the controller match the power of your mid drive motor to avoid any malfunctions. 【Consistency】: For nice results, it's crucial that the voltage across your motor, controller are consistent. This ensures smooth use and longevity of your bike components. 【Easy Installation】: Installing this motor controller is incredibly straightforward, it only takes a few minutes. Once installed, it can help rejuvenate your motor's performance. 【Material】: Made from sturdy ABS material, this controller is built to term. It measures 50cm in length when unfolded for installation. Specification: Material: ABS Size Chart: 50cm/19.69inch Package Includes: 1 Motor Controller Note: Please allow slightly errors 1-2cm differences due to manual measurement.