Speed Sensor Electric Bicycle Pedal 5/8/12 Magnets E-bike System Assist Features: Featuring simple installation and disassembly, it is more convenient to use.The function of this pedal assist sensor is to help extend cycling mileage with good accuracy. Extend battery life and improve vehicle cruising range. Avoid damage to the battery due to high current discharge This product is perfectly suitable for bike, electric bicycle, etc. According to the speed of the turn of the foot to identify the power, pedal up in the process of riding is more lightweight and electricity saving. Size:Diameter of outer ring 6.5cm, diameter of inner ring 1.5cm Package Include:1 * E-bike Assist Sensor Note: Due to different personal measurement methods, there will be an error of 2-4 cm, please understand Thanks for your support About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.