The purpose of any LED tail light is to make sure cars coming up behind you know you're there. The Planet Bike Blinky 3 does a fine job at that, stays put, has great battery life and doesn't cost much. You get two mounting options - a big cheap plastic clip for the seat post and a smaller clip for a rear side strut. I put mine on the seat post. In past years when I had a baby seat I would have used the side strut. You also get two settings - steady and blinking. That's the only negative in my book. I can't imagine using anything but blinking.

This is pretty much a no brainer. My wife's has been through almost 8 years of abuse and has had only one battery change. I didn't think twice when it was time for my bike and my son's to get this safety enhancement. I now bike a lot during the late night. I haven't had a close call with a car coming up from my rear yet. Enough said.

5 stars

This rear light can be seen for BLOCKS!! A great feature is the clip--it can be either clipped onto its seat post attachment or to a piece of clothing, if you walk at night. Battery life on blink (which is IMO much safer than constantly on) is weeks, if not months. Small enough to easily fit into a pocket, if you need to take it with. 5 stars

Nice and bright, different flash settings, great visibility, mounting needs a little improvement. If there's one piece of advice I can give is check your seat-post before using this light. The seat-post is the ideal spot for placing this since you want the flashing to be as high as possible. Unfortunately my Raleigh SC40 has a seat shock post which is far too wide to use the mounting :( The rear forks also do not accomodate the mounting so there are precious few places this can be done. Unfurtunately, this means my flashing light is relegated to operate from a plastic bag dangling from my seat :( 3 stars

Gave one of these to a friend who can't say enough good things about it, especially about the long battery life. 5 stars

I have these on the back of my xtracycle - which is a cargo bike. I have two mounted on the back, along with a Down Low Glow by Fossil Fool Down Low Glow Lighting Kit - Two Tubes -Ice(blue). They are very bright and last a long time. Easy to put on your bike too. Best of all they are made by Planet Bike, who gives 25% of their profits back to the community.

I also use Illuminite leg and arm warmers at night too Performance illumiNITE Leg Warmers 5 stars