Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Will the red one fit on a seat post, to be used as a rear light?
Document: Easy, quick attachment. Fits wide variety of handlebar/stem/post sizes. I attached white front light to handlebar and, without another alternative, the red rear light to seat post (vertically). Duration of battery power not confirmed and strength of light is difficult to discern without viewing from a distance, but pleased with initial quality/build and installation.
Adequately bright as  &#34;notice me&#34; lights, but definitely does NOT fit my standard road bike handlebars. I'm only able to use one on my seat post.
I've used a variety of "safety" lights on my bicycle (unless you're going big time on mega-bright lights for night riding, warning lights to prevent drivers from running over you is my goal) and these are the best I've found. Three settings--on, and slow and fast blinking--and quite bright, these fit the bill front and back. They're pretty stretchy (but not unbreakable as I tried to overextend them around seat post rails!) which gives them flexibility in placement.
these work nicely and fit a lot better than the much more expensive frog lights i used to have, but i really don't like how they look. the back one is orange which doesn't match my bike. the great thing about this style is that you can take them off really easily and attach them to your keychain/carabeener so they don't get stolen. would be a 5 if they were solid black or white!
These lights are great because I can keep them in my Camelback and switch them between bikes. This way I don't have to buy a light for each bike. I wish you could get two of the same color - for example I would have rather had two rear (red) lights, but overall this is a nice product.
The outer rubber casing is all that holds the headlights' battery in, but I suspect the unit will fail the first time it gets wet. Very poor quality control.The rear, red light is actually quite great. It clips to my helmet and can be easily mounted to any bike and is quite bright. If it wasn't for the damaged headlight I would give these lights 5 stars.
Red light doesnt work..... at all. Shipped on time, but only the white one worked, and its not "super bright". its just a mediocre bike light. go to your local bike shop and support them. These aren't worth the 20 bucks
they work well, just reveive them, the red one is very bright and the white one, its not too bright, it wontttttt light your path, but brith enough to be seen at night, super easy to put on and off, couple of mode intermittent etc... waterproof, recomended.....yes they do come with  batteries
I ordered two sets of these as a gift. When they arrived, one of the red lights was turned on and blinking. Since it had been on for who knows how long, nonstop, the light was incredibly dim and could hardly be seen at night. I emailed Amazon and they assisted in returning and ordering a new one at no expense to myself. I emailed them about the issue and had a new set of lights in my hands within 48 hours!
I've had these lights for six months. I installed the white light on my handlebar and, while it wasn't the brightest bike light you could imagine, it was good enough for me. The red one I fastened to my backpack so I would be visible while riding at night. Unfortunately the little plastic cap that holds the batteries in fell off of the red light as I was riding and the batteries and LED bulbs flew out of the casing.
Answer: yes