Love the bike, but had some problems starting out. Had a hard time figuring out the on/off switch. It didn't seem to work right at first. Light colors were out of sync. The dealer I bought it from in Colchester, Connecticut was no help at all. Didn't seem to know how it worked, nor was familiar with the light color sequence. I worked out that the battery was not seated properly. After reseating the battery, the switch and light sequence worked fine. No problems since. The battery does snap loose occasionally. I put a strap around it to ensure it doesn't fall out. The switch and battery clip seem low quantity. Everything else about the bike is terrific!