motownrockwrote a review of Serfas Handle Bar Light Plugs on February 23, 2011
Wonderfully convenient for those days you're out later than planned, or the rain or fog rolls in and you forgot your tail lights. These are subtle when not needed, both in appearance and weight (a cyclocomputer or wristwatch could add more weight to your bars than these). These aren't super-bright, but cars can definitely see you before they pass. The battery contacts wiggled loose on the first set I owned. Spoke to Serfas who sent me out another set with the same problem. 3rd time was a charm, though. These have worked for a couple of years. Maybe I got a bad batch, but the company was helpful in resolving the issue.