It is specially used to deceive the elderly. Sell jade beds, electrolytic water reduction machines, massage belts, etc. For the elderly, it exaggerates the publicity effect and claims that it can treat diseases such as diabetes, hypertension and rheumatism. First, invite the elderly to experience it for free, then brainwash them every day and buy them home unconsciously. Don't be fooled by each other easily.
If you are interested, you can search for "Dismantling the Electrolytic Reduction Water Machine of Health Square" in Baidu Digital House.