This product is made of high quality ABS material, which is durable and not easy to wear. Hall sensor has the advantages of small size, light weight, shockproof, anti-corrosion, dustproof, etc. It is suitable for use in electric bicycles. Precision machining, precision assembly, excellent quality. This auxiliary sensor is suitable for pedal-assisted electric bicycle drive system, saving time and effort. Applicable to almost all electric bicycles on the market, it is a good helper for electric bicycles. Condition: Magnets: 12 Line color definition: 1. Red 5V 2. Green signal 3. Black GND Installation and use: The middle shaft card slot rotates following the middle shaft, and the outer casing sensor is fixed. There is no need to disassemble the middle shaft, as long as the inner ring is caught in the middle shaft and the outer casing is fixed to the frame, it is convenient to install, stable and reliable. Right side installation: Step on the output pulse signal and reverse the step to not output. Left side installation: step forward output pulse signal, reverse step will not output. Colour:black Material: ABS Size:Length: 100cm Package Contents: 1 x Bike Pedal Assist Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.