This device uses electric current to stimulate muscles to achieve the purpose of 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. Many buyers say they don't work. After our verification, the situation is as follows. This massager has a total of 15 Level 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.Features 1.6 different massage methods: relaxing massage mode, hot cupping mode, scraping mode, pound massage mode, acupuncture mode,manipulation mode. 2. 3D smart technology, can easily adjust the electrode according to the neck curve. 3. Can be used on the neck., back, legs and waist, etc., for the whole body. 4. Can balance the nervous system, improve oxygen supply, micro-circulation and tissue cell nutrition. 5. Electromagnetic Pulse Magnetic Therapy Multifunctional Physiotherapy Pain Relief Massager. 6. Personal massager, small and portable, massage anytime anywhere. 7. Use 15 minutes is enough