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TENS Unit Nerve Stimulators

Transcutaneous electrical nerve stimulation (TENS) is a pain relief method that can be performed at home with the proper equipment. OTC Wholesale carries every device you need to begin TENS treatment. Using a mild electric stimulation from the comfort of your own home, it is possible to relieve pain from muscle, joint or bone problems, as well as many chronic illnesses, such as fibromyalgia and osteoarthritis.

TENS utilizes a small, battery powered device which connects to your skin to stimulate the nerves. This electric signal tells the brain to block normal pain signals and also produce endorphins. Typically it is best to consult with a physical therapist, acupuncturist or physician before beginning a TENS regiment. They will be able to assist in determining the proper wavelengths and frequencies to set your device.

When you are ready to begin a TENS regiment, OTC Wholesale has all the products you need including battery chargers, batteries, adapters, skin barrier wipes, treatment lotions, prep lotions and replacement wires. OTC Wholesale also services a convenient TENS bundle which includes all devices needed to immediately get started on a TENS treatment. Replacement parts are also convenient and easy to find making shopping as painless as possible.

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      Answers to your TENS Unit Questions

      What is TENS?

      Transcutaneous Electrical Nerve Stimulation (TENS) is a non-invasive, drugfree method of controlling pain. TENS Units use tiny electrical impulses sent through the skin to nerves to modify your pain perception. The main use of a TENS machine is for pain relief, particularly in the case of chronic pain. It is most often used for joint or muscle pain that won't go away, but can also be used to help treat nerve problems without resorting to drugs. It isn't uniformly effective, that is, different people will have different results. For some, TENS electrical pulses interrupt the pain signals so effectively that they are literally without pain. For others, the relief is nearly non-existent, but most commonly, this treatment provides considerable relief from the chronic pain that haunts the user.When the TENS Unit overrides the pain signal, it "tricks" the brain into thinking their is NO PAIN. TENS Units provide relief with nerve stimulation for back pain, foot pain, shoulder pain, neck pain, and virtually any other acute or chronic pain.

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      How does a TENS Unit help pain?

      Two small electrodes that are placed on either side of the area where the pain originates. The higher frequencies tend to block the pain signals, while much lower frequencies will stimulate the body to produce endorphins which naturally reduce pain. When the TENS Unit overrides the pain signal, it "tricks" the brain into thinking their is NO PAIN. TENS Units provide relief with nerve stimulation for back pain, foot pain, shoulder pain, neck pain, and virtually any other acute or chronic pain.

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      What is the difference between TENS and Muscle Stimulation?

      The main difference between the two is that a muscle stimulator is used to cause muscle contraction, while TENS focuses on nerve stimulation and tries to avoid contracting the muscles. Both use electrical pulses to do their job, but have different purposes. Muscle Stimulation is a very similar machine to the TENS, also using two electrodes to send electrical pulses through the body. However, the purpose is quite different. Here, the purpose is to cause the muscles to contract and the reasons have nothing to do with pain relief.

      Both TENS machines and muscle stimulators have their uses, but they are very different in their reasons for being used. If you are looking for an alternative to standard pain relief, then the TENS machine is what you should be looking at. However, for the prevention of atrophied muscles and to define specific muscle groups, the muscle stimulator is the way to go.

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      What does Single, Dual or Quad Channel mean?

      Generally, the TENS or muscle stimulator signal is between two electrodes or on a single channel. Therefore, the user can apply electrode stimulation to one site per channel. A dual channel device allows for stimulation in two locations using 4 electrodes and a quad channel device can use up to 8 electrodes. It is not necessary to use all of the channels available on a device, but each channel requires a pair of electrodes.

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      What are TENS Modes?

      The modes of the device refer to preset stimulation effects with changes to pulse rate, pulse width, modulation, frequency and sometimes amplitude. These modes are sometimes programs that start off at a certain rate and then proceed to other modes of stimulation. The purpose of these modes are to help the user quickly and effectively apply a therapy that is suitable for an individual complaint. Stimulation can be very specific to an area of the body and the cause of the pain. For instance, the Ultima 20 mode device has specific mode setting for Neck, Torticollis, Low Back, Sciatica, Epicondylitis, Wrist Pain, Post-Surgery knee pain, Ankle sprain, Knee pain, Hip pain, Menstrual pain, and Neuralgia, as well as, 8 additional preset modes.

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      How are IF Units and Galvanic Units different from TENS Units?

      Interferential Stimulation differs from TENS because it allows a deeper penetration of the tissue with more circulation and comfort. Interferential Stimulator (I.F. Unit) is used to treat, relieve and manage chronic pain. It can also be used as adjunctive treatment in the management of post surgical and post traumatic acute pain. Interferential Units provide deeper stimulation that traditional TENS Units.

      Interferential Stimulators are a low frequency treatments with the transmission of pain messages at the spinal cord level. It stimulates underlying nerves producing a mild, tingling sensation to provide relief from chronic and acute pain. Interferential is used for very localized areas where deep current for pain control or increased circulation is needed.

      Galvanic stimulation is most useful in acute injuries associated with major tissue trauma with bleeding or swelling. In contrast to TENS and IF units, which apply alternating current, galvanic stimulators apply direct current. High-voltage Pulsed Galvanic Stimulation (HVPGS) is being used for wound healing, edema reduction and pain relief carpal tunnel syndrome and diabetic neuropathy are examples of where galvanic stimualation is used. Direct current creates an electrical field over the treated area that, theoretically, changes blood flow. The positive pad behaves like ice, causing reduced circulation to the area under the pad and reduction in swelling. The negative pad behaves like heat, causing increased circulation, reportedly speeding healing.

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      Why use Silver Electrodes instead of Electrodes?

      Silver Electrodes refer to carbon electrodes that include a thin layer of silver between the pad and the backing where the actual wire connection is made. This silver forms a better connection between the wire lead and the electrode, and distributes the electricity more uniformly across the pad. Silver Electrodes are slightly more expensive to produce, but they are substantially more effective at delivering the electrode stimulation treatment to the effected site. Whether you are using a TENS unit, Muscle Stimulator, Interferential unit or a Galvanic unit, you will get a lot more out of it using a silver coated electrode.

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      Transcutaneous Electrical Nerve Stimulation (TENS)

      TENS is a non-invasive, drug free method of controlling pain, which uses tiny electrical impulses sent through the skin to nerves in order to modify your pain perception. In most people it is effective in reducing or eliminating the pain.

      Electronic Muscle Stimulation (EMS)

      EMS works by sending electronic pulses to the muscle(s). This is achieved by sending low frequency electric pulses through muscle tissue causing them to gently contract. In this way the muscles are passively exercised and blood flow is increased

      Galvanic Stimulators

      Galvanic Stimulators use direct current, which creates an electrical field over the treated area. The positive pad works like ice, causing reduced circulation to the area under the pad. The negative pad works like heat, causing increased circulation.


      IF sends small comfortable electrical impulses through your skin to work on deeper tissue stimulation. The sensation works to prevent pain signals from reaching the brain.


      Infrared Light Therapy help the body by delivering specific light waveforms that increase circulation. Increasing circulation helps promote healing, lessen swelling, and helps in reducing pain.


      Portable Ultrasounds give advanced pain relief using sonic stimulation of soft tissue cells. They generate pulsed, high frequency sound waves, which travel deep into the tissue, generating vasodilation. This helps increase blood flow to the treated area.


      Russian stimulation uses medium frequencies to provide stimulation to muscle groups. This is used to reduce muscle spasms as well as for muscle strengthening. This method was created to produce maximal muscle strengthening effects.

      Micro Current

      Microcurrent Therapy uses extremely small amounts of electrical current (millionths of an amp) to help relieve pain and heal soft tissues of the body. The electrical current used in Microcurrent Therapy is so small that it is rarely felt.