My wife had back surgery about 6 years ago, well she had trouble sleeping because of pain. My brither gave her one of these wristbands and she sleeps a lot better. I don't know if they really work or not. I'm a born skeptic. As for my wife and brother they swear by them. So I buy them in bulk, sell them and list them on Listia. A lot of people who get them love them.
They are silicone wristband with 2 magnets on opposing side. They are supposed to help with balance. I think the magnets are supposed to help with the electrical currents in the human body. As for me I can't call it.