Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: how long do the batteries last?
Document: My husband is an avid outdoorsman and he loves gadgets. Big gift hit for under the tree. It is super light and stays on his head with no difficulties. Lights up the dark quite well for the size. Only time will tell how long the battery will last
Of course, it uses CR2032 (aka standard watch batteries), which way less than 0.1 oz each, so you can keep a month's worth in your pack with very little penalty.
I'll be thru-hiking the Appalachian Trail, and just took this little guy out for a test run. It's a keeper. The headlamp weighs 1.1 ounces (by my scale, including batteries) and you get a lot for that weight.
This headlamp is compact, nice looking, uses convenient batteries, water resistent. But I was some disappointed of it and thought between 2 and 3 stars. The reasons are:1. It does not have current selfajuster. So the brightnes is not constant and depends on condition of the batteries. It should not work this way for its price.2. The control with 1 button is inconvenient.
It takes the same CR2032 batteries as the Petzl unit and even though it doesn't come with a nifty case like the Petzl it has the  &#34;backpack safe switch.&#34; This means it would be next to impossible for it to get turned on accidentally. So in summary I would recommend this light. It's great and useful for almost anything AND it can also make a good backup emergency light.
its ultralight and in my opinion not nearly enough light to hike with but just enough to maneuver around camp. it starts off bright but dims immediately until dead steadily for 31 hours. its only bright enough for chores for 8 hours after that its dimmer than an emergency candle. the black diamond storm is pretty nice for an alternative
i am a light snob, i like clean clear light sources. and although this isn't a perfect beam. it is light enough and small enough to be great for back packing. it isn't great for night hiking, but for general around the camp stuff or walking into the woods to pee at night. this thing is perfect.
We bought several of these for use as backpacking headlamps. The lights themselves are very well thought out. The push button switch for turning the light on requires that it be held down for a full second before the lgiht turns on. This prevents the lights from turning on accidentally when jostled in a backpack. The light turns on first to a red color in order to prevent loss of night vision.
This light has a lot of features that I like and I look forward to using it for some time.I think it cost too much, can I say that and have my review not disappear?
This is so light, I keep it in my purse. it's great because it has different settings for brightness, and it is also great for biking because it has a blink mode. The hat clip is very tight, which is great.The light itself also can be angled downward from the hat clip (or if you're wearing it as a headband), so you can go walking with it and see where you're going without completely blinding anyone coming toward you.
Answer: yes