GLO Rear Light
The GLO Rear Light will keep you out of harm's way by ensuring other drivers and riders see you traveling down the road or trail. This handy three L.E.D. light is perfect for the commuter or night time rider that likes to be seen. It comes complete with two AAA batteries, a seatpost/handlebar mount, and has two modes (solid/non-flash, and flashing). Don't be caught in the dark without the proper protection, let GLO be your go-to brand for all of your safety needs.
I bought this and a night rider TL-5, this was brighter than the TL-5 but wouldn't fit around a standard size mountain bike seatpost. Luckily for me I bought a new bike for my son for Christmas. And it fit that seatpost perfectly.
Almost identical to another taillight I have under a different brand. Gives off a lot of light and gives me confidence that I'll be seen at night when on the road or in the bike lane.
I bought this particular light as a supplemental safety device. I clip it to my backpack. You can use this light on your seat post as well w/ provided mounting hardware.