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