Breed maltipu, 4kg, the collar came up normally in size, not heavy for the dog. I thought that the current would work, but even a sound signal was enough to stop barking. It costs at level 4, but it works every other time. It often works when the dog just gets up and shakes himself. It turns off by itself, although it is fully charged. In general, the idea is good, but I think that the money is not worth it. It's better to pay more and get something better.
To help provide a better understanding, I've attached some photos.
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