Instruction: Answer the given question using the supporting document.

Input:
Question: Is the knife sharpener electric?
Document: Works great on tall cans that you're trying to open, but other than that it's just your run-of-the-mill electric can opener. Will be shopping for a heavier one with a knife sharpener.
I haven't used the knife sharpener yet, but I don't usually use electric for sharpening my knives. For this price, this product is well worth the money and I recommend it.
i am happy with the purchase, especially the price.I'm not sure how effective the knife sharpener is as I have not used it.
Great can opener. As promised, it opens all sizes quickly and effortlessly. The knife sharpener on the back is great as well.
Inexpensive, reliable and very well made. The knife sharpener is worthless but its a good kitchen device. I would buy again
very nice opener. Easy to use. Highly recommend it. cutting edge is very sharp. Easy to clean. Knife sharpener is adequate
Bought this as a Christmas gift for us. Our old opener always seems to fight us when we wish to open a can. This unit takes the can and opens with ease. Have not tried the knife sharpener yet.
I am very  happy with this attractive and useful can opener! The knife sharpener feature is great too;-) It sharpened one of our favorite old knives which had become very dull over the last few years, and now it works great again!Thank you Amazon!
I have arthritis in my hands and was finding a manual can opener difficult to use. I've used this only a couple of times since I got it, but it's worked fine so far. It doesn't have a knife sharpener, but I don't need one.
Opens various size cans...easiest can opener to use I have ever owned...it has I knife sharpener on the back but I have never used it so I really can't give a review of that feature but works great as a can opener!
Answer: No, the knife sharpener isn't electric.  You need to insert the knife into the slot that's on the back of the unit and sharpen the knife manually.  Depending on how dull your knife is, you may need to pull it through the sharpener about 10 times, which is standard for most manual knife sharpeners.