Planet Bike 3034-1 Blinky Superflash .5 Watt LED with 2 Red LED Tail Lights (Black/Clear Case)

The light itself is great! Approximately 2x1x1", sturdy, relatively water resistant, and doesn't seem to be prone to damage. The 'button' is well designed covered by the plastic case (press lightly on the case, which will then press the hidden button). As for the light, works very well, grabs attention during day and night! Focused to point in a straight cone, but has light to the sides and top/bottom (overall visible from side and back; best for cars coming from behind). Blink pattern is 'blink blink blink BLINK BLINK' (very fast blinks, from the 2 small LED's and then twice from the larger LED). Also has steady ON mode.

Only bad thing is the attachment mechanism. It's plasticky, average construction (doesn't seem like it will break though), not very sleek, and might allow the light to accidentally tilt if not tightened completely. There are three given ways to attach: 1 use the clip (which is non removable, but replaceable if broken), bad thing is that the clip will allow it to point down, causing the bright spot to point away from cars. 2 use the seat post clamp (comes with thick and thin rubber liners to increase grip on the seat post), works good UNLESS you have a seat bag, which may get in the way. 3 Attach to seat stay (the slanting bar connecting the rear wheel to seat). This lowers the position of the light, which *might* block visibility. Other than that, I like this position.

Other reviewers have raved about this tail light and I have to agree. It is very bright and easily seen by cars approaching you from behind. Where it shine best (no pun intended) is during the dawn or dusk hours. I find riding bicycle during that time the scariest because you think you can be seen but honestly there has been times where I have been scared out of my wits because cars didn't see you even though there was still some sun light left. Having this very bright blinking tail light will definitely get driver's attention and minimize chance of getting into accident.

The light is bright like everyone is saying.

My problem is one day I looked down and it was gone - jumped the mount.
I was riding over a lot of rocks and I guess it popped out. That had me
really steamed. I also had a air pump that shook apart too.

All the mounting systems are very similar, but I cannot afford
to spend whatever it is for a light, nice as it is and have to take
it off all the time or buy a new one when it falls off.

Someone should come up with a flexible mounting standard,
all of the ones I have seen are terrible.

EXTREMELY BRIGHT LIGHT. Viewable distance is excellent. But the best part is the flashing scheme. It does not flash like any ordinary flasher. It has 2 smaller LEDs that flash together and there is big strobe LED that flashes out of sync from the other 2 LEDs. This light pattern catches the attention of drivers much better than a regular flashing LED.

This is an amazing light: seriously (almost blindingly) bright and very red, yet it's black and white when it's off.

I lost mine about a month after I bought it. I quickly bought another. There is really nothing else like it.