It works and is not cruel
We have a great dog. She just would become a royal brat in very specific circumstances outside, and she was also a digger. Putting a long leash on her solved the problem, but she knew the difference between when she did and didn't have the leash on her, and having a 10-ft leash could be dangerous if she got hung up. With this, the correction is quick and specific to the behavior, which is important. For example, when she's digging, I can hit the button from the house and she thinks the shock is coming from her action and not from any outside force, which is more effective than yelling at her and only teaches her not to dig when I'm around. Just know that it's not a quick fix and involves you to commit to the training (follow the instructions and carry the remote with you at all times, so you can correct your dog EVERY time she does the behavior you want to extinguish).
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