Tongsheng Mid Drive Motor – TSDZ2B. Torque Sensor Technology : Both models feature advanced torque sensor technology that automatically adjusts power assistance based on your pedaling force, providing a natural and responsive ride feel. Quiet Operation : Experience a smooth and quiet ride, thanks to the innovative design that minimizes noise, so you can enjoy the beauty of your surroundings. User-Friendly Installation: Widely compatible with BB 68-73mm bottom bracket, easy to install on most bike frames, making it a hassle-free upgrade for your e-bike setup. Rated voltage (DCV): 36V. Rated power (W): 250W. Pedal sensor: Torque Sensor Is Integrated Into The Motor. Bottom Bracket Length: 68-73mm. Bottom Bracket Diameter: 34-36mm. Noise level (dB):? 55. Current cutoff as long as pedaling stopped. 1 PC 36V250W Mid-Drive Motor. 1 PAIR Brake Levers or Brake Sensor. 1 PC Thumb Throttle. 1 PC Display (Optional). 1 PC Power Connection Cable. 1 PC Installation Tools. 1 PC Speed Detective Sensor. If you choose the battery option, it comes with a charger. If you choose “no battery, ” please note that the motor kit does not include a battery. We make sure all of our items are brand new and in excellent condition before dispatch. We are willing to satisfy all customers. We are willing to respond to your inquiry in 24 hours usually. Your recognition is our motivation in developing our small company and improving our service for each customer. Our aim is to provide Level Customer Service. Your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfied.