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: Is this battery operated?
Document: Well made, Quality product that does an amazing job! Product will put a better edge on knives then when original. Evaluated sharpeners for awhile. The 50281 is the best bet for sharpening different types of knives. Jighly recommend this item&#62;
We have several diamond blade knives that need an 18 degree edge. At first we were skeptical about whether this would work or not. It is fantastic and so we bought another one for a gift this Christmas. It makes sharpening our knives much easier and less time consuming.
This sharpener doesn't do as good a job as my $9.00 Smiths Pocket Pal sharpener. For the price it should do a much better job.
This Smith;s 50281 Adjustable Edge Pro Knife Sharpener ,is a quality, hard working, very dependable, way to keep all of your knives ,from the cheapest to the most expensive very sharp ,and it is very easy to use.
The Smith has 20 of which 10 are dedicated ceramic wheelsto honing the blade to hair shaving  sharp. Smith says you will only need to use the diamond side if you have a dull blade. If  you need a serrated edge sharpened, there is a little tab which pulls out on the side just for that purpose.
My knives have razor sharp edges now, and it's so easy to use.
It operates as advertised, it is simple to use and I would recommend this product to everyone!
I work as a meat cutter and was looking for a faster way to sharpen my knives so I thought I would give the Smith's electric a try. I am now sharpening all the knives at work and all my friends home knives and everyone is happy with the results. The knives still need a little on the honing stone after to get a good razor sharp edge but for the time it saves it was worth the money.
I like the fact that you can adjust to the factory angle or put the angle you want. What a great product. Just what I wanted.
I have tried several other interlocking wheel sharpeners and the Smith 50281 is by far the best for under $200. Even so, the next step up is $1000 for the Tru-Hone from the UK. This unit is  impressive in every aspect. It is solid and stable and carries one set of dual-sided diamond sharpening wheels for shaping the edge and one set of ceramic wheels for honing.
Answer: no