Feature 1External speed sensor hall for controller of electric bike, scooter and so on 2The magnetic head is made of quality material, anti-rust, corrosion-resistant, durable 3Easy to install, just clip the magnetic head to the spoke, and when wheel runs the magnetic head would work to transfer signal to sensor 4It is used to provide sampling signal for LCD/LED display of electric bike, so that display can test bike speed 5Nice accessory for DIY your own electric bike or scooterSpecificationFeatures: External speed sensor hall for controller of electric bike, scooterand so on. The magnetic head is made of quality material, anti-rust, corrosion-resistant, durable. Easy to install, just clip the magnetic head to the spoke, and when wheel runs the magnetic head would work to transfer signal to sensor. It is used to provide sampling signal for LCD/LED display of electric bike, so that display can test bike speed. Nice accessory for DIY your own electric bike or scooter. Specification: Material: Plastic Color: Black Cable Length: Approx. 186cm / 73.22inch Magnetic Head Size: Approx. 1.6 x 1.2cm / 0.63 x 0.47inch Weight: Approx. 48g Package Included: 1 x External Speed Sensor 1 x Magnetic Sensor Note: Black cord is for groundelectrode, red for 5V power, green for Hall signal. .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; }