Accessories

Bright is an understatement
I bought this light after a few weeks of painstakingly trolling Amazon for a quality and inexpensive light. I was originally attracted to the sleek futuristic looking design, followed closely by its high reviews from other customers. As others have noted, I see where a small crack could form on the backing, but a properly sized screwdriver and some gentleness should alleviate any problem. This light is great. It fits on my bike snug, it has 3 separate functions, all easily operated by a single rubberized button Also, it is REALLY bright. (WARNING: don't look into this light directly if your eyes are sensitive) I would definately suggest this to anyone looking for a cheap, well put together light.

Rear bike light
I had one before and lost it somehow, so I ordered another. They have a great visibility range and several settings for display. Great product, will provide notice for your safety.

Liked it
The flash mode is the best I like in this product. It can be seen from far off which is good when biking in the night.

Good bright rack light
Blackburn Mars 2.0 Flasher Rear Bicycle Light I commute by bicycle 12 months a year. I carry panniers and a bag that sits on top of my rear rack. Most rear bicycle lights are designed to mount on the seatpost and do not come with mounting hardware that permits easy mounting of the light on a rear rack. The top bag I use would block the view of seatpost mounted light.

I wanted a light which would mount to a L bracket bolted to the rack. The Blackburn Mars 2.0 is one of few that can be so mounted without lots of jerry-rigging. Strengths: The Blackburn Mars 2.0 is lightweight, bright, enjoys long battery life and has several flashing patterns. Drawbacks: The on/off button is hard to use with gloves on and mounting to the L Bracket and dismounting from the L Bracket is a little tricky, depending on your L bracket. There is a black plastic clamp on the back that you may have to shave off a little to get your L bracket between it and the light for mounting. Still, it is the only light I have found that mounts this easily on an L Bracket. I recommend it to all who bicyclist who use a rear rack and trunk bag.

Nice big bright taillight
Summary: High-quality construction and very bright red LEDs help ensure visibility, all at a very nice price.
Pros: Sturdy design with rubber rim and rubber gaskets around screwholes. 4 *very* bright red LEDs facing back are the primary lights; 2 less-bright yellow LEDs facing outward on the sides provide side visibility. The steady, flash, and chase modes provide a good variety of lighting modes, and the belt clip and tube mount each provide secure mounting. Alkaline batteries are supplied in package.
Cons: Must fully unscrew thumbscrew in order to release light from bike when tube mounted. Belt clip *must* remain installed, as otherwise 2 of the 4 main screws securing the case closed are too long to be fully tightened. 3 of the 4 main screws needed to change batteries are tiny and need to be tightened carefully to avoid damaging the plastic case or screw.
Overall: This would be a 5-star bargain if only the light could be clipped in/out of the tube mount. That minor defect and the tininess of 3 of the case screws lead me to rate it at 4.5 stars.