Santamedical electronic tens pulse massager features microcomputer controls therefore you can easily adjust massager with available six automatic programs and three diverse styles of modes. The device has dual channel system; hence it can easily work two areas at one time. Recomended by doctors, this is best handheld tens massager in the market. Buy with Confidence, Santamedical unit is FDA approved. Quality - Santamedical unit is designed with quality and durability in mind. Our factory is ISO-9001 certified. It conforms to international medical standards of excellence in manufacturing. We Offer 100% Money Back Guarantee: If you're not happy with it, ship it back and we will refund your money. Buy Now with confidence knowing that 1000's of others have been completely satisfied with their results because of our 100% money back customer satisfaction guarantee. Six Auto Modes (stimulation programs) , Fully-adjustable Speed and Intensity, High Frequency stimulation to relieve pain 4 Attachment pads included, Power: DC 6V (4 AAA batteries included) Best unit for Stress, Muscle Soreness, Stiffness, or Chronic Pain. The Simplest Tens Pulse Massager Is Also the Most Advanced LCD shows massage style, intensity and time remaining; Three selectable massages Small and Lightweight - At only 5.3 ounce, is no bigger than a remote control, , this unit packs enough power to thoroughly massage your body, but can travel with you anywhere you like I really like this tens unit. If you are looking for something that works to get some pain relief then this is the product for you. I love this tens unit. This is really nice because it has several different settings that you can use in order for different areas of the body. This is not as powerful as a professional unit that you would see in a PT office however it is strong enough to give a good amount of relief. I love that this has four pads that can be used to give a wide area for use. The tens unit has a variety of settings that you can chose between personally I like the kneading setting and the massage setting because they are perfect for sore muscles. I am very pleased with this unit and would recommend to anyone needing some pain relief. I was given this unit free in exchange for my honest review and can say I am pleased with it and would order again.