The Beurer EM59 uses TENS technology to provide massage-like relief of muscle tension.Enjoy this TENS EMS device after a stressful day at work to relieve some of your stress and trigger points in your body.Comes with 44 pre-programmed applications including TENS, EMS, and massage, and offers 6 customizable programs.The innovative heat function can be combined with the TENS or EMS function to further enhance treatment.