Description: This 5 magnets sensor is specially designed for electric bicycles, which can adjust the riding intensity at any time according to the wind direction, slope and speed. The induction element adopts the integrated structure design the built in disk, which realizes the concentric movement of the disk and the induction element. High sensing sensitivity, stable signal, convenient and fast installation, beautiful appearance. Makes riding easier, extend battery life, improve the cruising range of the whole vehicle, and avoid the damage to the battery caused by high current discharge. Lightweight and power saving. The line is 94 cm long and has a moderate length.Suitable for most electric bikes. Specification: Type: Pulse assist sensor Material: PP,Metal Size Chart: 6.5cmx6.5cmx0.2cm/2.56inchx0.08.56inchx2inch wire length about: 94cm/37.01inch Package Includes: 1 Set Electric Bike Power Pedal Assist Sensor Note: Please allow slightly errors due to manual measurement and different monitors.