How can I turn on the lights on C-class? May 02, 2020 01:24 Press and hold + button for 3 seconds. Related articles What kind of maintenace should I do on my C-class? What's the max speed of Ariel Rider C-Class Commuter Ebike? Does the battery charge when I pedal? How can I increase the pedaling resistance? The speedometer isn't working Comments 0 comments Please sign in to leave a comment.