Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: how do you sharpen the blade  once it gets dull   Carl
Document: Gave to brother - who is hard on knifes - but used only to clean fish -- blades were dull in a few months and he said he could not use any more -- checked and blades dull -- oh well-- bought him a high quality regular knife and he still has it
Great for cleaning a bunch of fish. I used it on stripers and it cut right through the rib bones. It does not come with a blade shield so be careful; I made a shield out of cardboard and duct tape, which works fine. The lithium battery goes forever.
The knife doesw a good job. I particularily like the battery life. (My old Sonic Blade gave me lots of grief with the batteries). It's too soon to tell about my new knife as far as battery life. I'm hoping I'ii be able to get replacement blades and batteries as needed.Dan Orvis
When i received my knife I immediately ran the motor to see how quiet and smooth it ran. Next step was to insert the blades and see how the knife felt while running, O.K. so far. I then tried to remove the blades, no such luck. After being real careful not to slice my hand with my effort, I got one blade out. After some struggling, I was able to get the second blade out.
Have used the ION lithium for 7-8 months. Have easily over 100+ catfish under its blade. I love love it and I hate it! When it's at full charge and fish are 8-10lbs it's great! Larger 20lb+ I'm having trouble with the Rapala keeping up. Also, the blade release buttons are in a very poor spot! I've had the blades come completely OUT 35-40 times!
I'm old school. Fly-fishing and fixed blade knives never fail. However I recently converted to the Lithium Ion Cordless. I have used other corded brands and was not impressed. I just took this knife on a six-day fly-in outpost trip. The battery lasted six days cleaning 12-15 walleye each day for six days. That's good enough in my book.
This does everything I hoped it would and more. Have owned an electric filet knife for years and not have a cord is awesome. I also have found that the way the blade is designed it seems to skin filets with much less effort. Great choice for anyone. Also bought an extra battery and haven't needed it. Filleted over a hundred gills, perch, walleye and specs. All on first charge. Only use my regular knife to cut out ribs. Great buy for the $.
Can't yet speak to battery life as I use to fillet Steelhead and salmon. So far a charge easily gets me through a creel limit. The knife greatly improves efficiency, cuts cleaning time by half and yields really nice fillets. The safety switch was a pain to locate. Might have been easier had I read the directions.
would have given it a 5 star if it came with a carry case...awesome knife, right on the ice, perch, gills, crappie
this is one great knife. the battery lasts much longer than the old rapalas-in fact you can use the blades from all electric or battery powered knives as replacements. not true with the berkley the blades are notched just the opposite of a rapala.
Answer: no