I got a $25 one off Amazon, Healthmate Forever. Seems to help when my feet and lower legs feel bad, like a different type of buzzing and tingling. But shortly after use I am back to where I was. I used it daily at first then sporadically. Research claims it can help 😏 but only $25 and plenty of good reviews, easy to use after first time, and from what I’ve read any purchased for home use are not dangerous.