Wow, buying the Blackburn Mars 3.0 was a negative experience all the way around. First of all (and I'm definitely NOT a tree-hugging granola head), I was offended by the excessive packaging. It was very wasteful. And then only after I opened the package did I discover that installing the batteries required a tiny phillips screwdriver that many people won't have. Plus it was tedious to remove and replace the three tiny screws. It would have been more helpful if they put the battery installation instructions on the back of the excessive packaging. Then I found that the battery tray was too tight, requiring a lot of force to pop the batteries in. Then I discovered that the unit was broken. One LED lit up but the button didn't do anything. I'm glad it was broken because when I returned it I then discovered the Planet Bike Superflash, a fantastic little tail light that comes in very simple earth-friendly packaging.