Feature 1Electric bicycle speed sensor (known as PAS, wheel mounted sensor). 2It is a high-tech component designed for electric bicycle with ergonomics. 3It has superiority to match well with all electric bicycles available in the market. 4It 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. 51:1 power assist. Make cycling easier and funnier.Specification 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 .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }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.