This is a fairly lightweight device, but it feels solidly built when it comes to how it covers the cutter on the can. A second press of the button to stop the opener doesn't make much of a difference. I complain that it *barely* has enough power to open a medium can. In our first cut it stopped after 1/2 inch. I confirmed that the batteries were not fully charged (and not dead). I have confirmed new batteries installed and they worked but had trouble getting through the cut with a heavy load. with a small engine. I doubt it will hold up to a large jar (or multiple jars at a time) but haven't tried it yet. If I were designing this I would use 4 AA batteries instead of 2 batteries to give the cutter more torque. A+ for box storage ability, C for my assessment of how it will perform over the long term.
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