Description This device uses electric current to stimulate the muscles to achieve the purpose of the massage. There are 6 modes in total. 15 strengths. The intensity is too low to feel noticeable. When the intensity reaches a certain level. You will feel an electric shock. Recently, many buyers say they don't work. After our verification, the situation is as follows. This massager has a total of 15 levels, when the massager is turned on, the intensity may be too low to feel very small. At this time, you can press "high" to increase the intensity.