The only effort with this opener is squeezing the can rim. Then he stops by itself and it only needs to be rotated. A short press on the red lever to the opener will open again and can be solved without any mess from the can. I do not know whence my box was, in any case, the magnet has not helped. Therefore, the last star with a thick question mark, the magnet has no force or was the aluminum can ?!
The cleaning is quick and easy in normal rinse water.
Against all other opener, I was able to try so far, this was really the best. highly recommended!