NiteRider TL-5.0 -5 Led Rear Safety Light
The TL 5.0 has five ultra bright LED's with four different operating modes, including three different flash modes. The TL 5.0 will help keep you safe and seen from behind (180 degree visibility). The TL 5.0 operates on 2 AAA batteries for up to 160 hours on flash.
Great item for the money, until you hit a significant bump in the road and lose the lens and batteries...thankfully I always have two lights out back. After that, you will look for another option because a good deal it isn't if you have to keep buying lights.
Very visible, 4 modes (solid, 2 alternating blink modes, and one full flash mode). Set up easy and seems solid. Great for commuting. Very tempting at the price.
Basic single-button operation, but somewhat fragile in nature. I felt like I was going to break the lens during remaoval/installation of batteries--BE CAREFUL. Post collar sees a bit small in my opinion. I have two posts that are 30.0 or larger, and the collar barely fits aroung my 30.9mm post w/ the smallest grip-spacer (product comes w/ two that can be used simultaneously or individualy). Don't let the product description fool you! While the LEDs in this device will blind you, they only operate in two "flash settings" among the "four operational settings": 1) ON/Steady (not really a flash mode); 2) ON/Uni-directional flash (left to right, almost like a turn signal); 3) ON/bi-directional flash (Knight Rider mode - not as cool w/ 5 LEDs, only 3 of which are visible head-on); 4) OFF Easily worth the money. Should work out fine for my pre-sunrise rides in to work.