It just doesn't work. I have used other similar products and they have worked well for at least a year. This one doesn't work at all. After going around the tuna can five times and doing nothing more than creating a path around the can, I experimented. If I squeeze him firmly with a finger while he does a spin and then let him do another spin on his own, he pops open a can of tuna in about half the time. The advantages are that it is much stronger and has more weight than most advertised. It's powerful too, using four batteries instead of two like the others. I had high hopes for this device but it doesn't cut mustard or anything. I would not recommend that.
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