This works exactly as expected, except that it is not strong enough. My use is muscle pain: back, hips, neck, etc. I wanted to massage tight areas while soaking in the bath. I probably feel it most at medium speeds: the lowest and highest settings are totally useless, and medium maybe 10%-25% useful? I give it three stars because it works underwater. We can use it for pain in small muscles such as the temporomandibular joint or the wrist muscles.
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