These things are absolute piles of garbage. Their videos and website make it seem like these are rugged and do something magical. They are basically very weak vibrators - like the kind that makes your cell phone vibrate - only about 1/4 as strong. They have a very loud vibrating sound that is super distracting. There is no stress relief at all. You'd be better off buying a small vibrating massager for $10 at a drug store and wearing that. It would be stronger, less noisy, much much less expensive - and equally ineffective. TOTAL GARBAGE.
Bottom Line: No, I would not recommend this to a friend
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