Help healing and relieve tension with this acupuncture like device. Just place this tension reliever on the spot that gives tensions and push the plunger; It has been loved by Chiropractors, Orthopedic, Rehabilitation, Sports and Physical Therapists since 1980's. Do not use - if you are pregnant or have a pacemaker. You should always speak with your physician or healthcare professional before starting any self treatments. No battery No Power needed.