Delivers electric impulses to tired and sore muscles. Your muscles respond to the impulses by contracting and relaxing rhythmically, which sends soothing massage sensations to relieve muscle tension and soreness. Eight massage modes with 20 intensity levels each provide various combinations of massage sensations. Your body tends to get accustomed to one particular sensation and will eventually stop responding to it, the different sensations available on this unit ensures that your body does not become desensitized. Use regularly to improve resistance to fatigue while increasing endurance; relax muscles and relieve muscular spasms; accelerate microcirculation and promote the absorption of inflammatory substances. This product is easy to use and small enough to carry in your pocket, take it with you and use it wherever you are. Dual-channel: for simultaneous use on two users or the ability to use 4 pads 8 massage programs; 20 intensity levels; Liquid crystal display Pulse rate: 1-200Hz; Timer: 10 to 60 minutes (in 10 minute increments) Pulse intensity: 120V/5.1K; Pulse width: 100US; Intensity range: 0-110 volts FDA listed MODEL NO - UC-031