An on/off button also programmes the many settings. The lower plug is for the speed sensor which runs off your spoke speed, much as a cycle computer does.
Newsletter Terms & Conditions
Please enter your email so we can keep you updated with news, features and the latest offers. If you are not interested you can unsubscribe at any time. We will never sell your data and you'll only get messages from us and our partners whose products and services we think you'll enjoy.