Features 1、Electric bicycle speed sensor (known as PAS, wheel mounted sensor). Features: Electric bicycle speed sensor (known as PAS, wheel mounted sensor). It is a high-tech component designed for electric bicycle with ergonomics. It has superiority to match well with all electric bicycles available in the market. It employs the dual-magnetic loop - Hall elastic angle difference to detect the dynamic torque, which is converted to DC signal and sent to the controller. 1:1 power assist. Make cycling easier and funnier. Specifications: Condition: 100% New and High Quality Material: Steel Magnets: 12 Disk Diameter: Approx. 65mm/2.56' Steel Ring Diameter: Approx. 35mm/1.37' Cable Length: Approx. 1.1m/43.3' Weight: Approx. 50g Packing List: 1 x Electric Bicycle Assistant Sensor Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List