Neck Relax Either side massager will have an on and off catch, and the other will have catches to increment and decline the recurrence of the vibrations. This will assist you with setting it at one that suits you best. It runs on a blend of advances, which incorporate ultrasound, infrared warmth, EMS (Electrical Muscle Stimulation), and Magnetic treatment. Thus, when you switch it on will make the massager delicately ply the bunches in your irritated neck.