It is an indispensable kitchen tool, especially people who have arthritis or osteoarthritis problems of hands. But everyone is benefiting. I use for round boxes, rectangular, they come with an opening system incorporated, at least the ones I used to use. The mechanical opener all have problems, and so different from this one, that we are delighted to have in the kitchen. However it has a drawback: it fears water. I had a small accident and the water came good in the battery compartment, and I had to change it because it was no longer used. Be careful not to wet.
