Generally speaking, electrotherapy instruments are only good for purifying blood, and are indeed good for some vascular diseases, but these instruments have certain dependence. Leaving these machines is not only no longer good, but also damages the original accumulated benefits, which is the biggest side effect. In my opinion, exercise is better than anything else. Old people can take a walk instead of using any machines. So as not to form excessive dependence! Besides, the cost of such a machine is several hundred yuan, so it is not cost-effective to sell several thousand pieces, and the profit is high.