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IF4000 Classic Interferential
FDA Class II Device Sold by Prescription or to Health Professionals only (Canada and International exempt).
IF4000 Classic Interferential
Item Id: IF4000-TP

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Available by prescription only, unless you are ordering outside the U.S., or are a Licensed Healthcare Professional. Your prescription can be faxed to Prescription Required (U.S. orders).  Upload here  or fax to 1.866.682.7756 (toll free) or emailed to
Analog Interferential Unit. Dual channel for use with 4 patches. Includes carrying case, manual, battery, leadwires, patches, 1 year warranty.
Common Uses: Back pain, post-op pain, post traumatic acute pain, chronic pain, localized areas where deep current for pain control or increased circulation is needed.


  • AC Adaptor
  • Durable plastic belt clip
  • 1 Year Replacement Warranty
  • Channels: Dual Channel Interferential
  • Carrier Frequency: 4000Hz Fixed
  • Difference Frequency: 1-150Hz Adjustable
  • Four Frequency Shifts: Continuous, 1/1 abrupt, 8/8 abrupt, 10/10 ramped
  • Wave Form: Symmetrical Bi-Phasic Square
  • Power Source: 9 Volt DC Adapter or Alkaline 9V battery(9V battery not recommend for its short life)
  • Warranty: 1 Year warranty against manufacturer defects. 
  • System Includes: Stimulator, Instruction Manual, 9V Battery, AC Adaptor, Leadwires, 4 Electrodes, Carrying Case Included.

Q. What is a TENS Unit?
A. TENS is an acronym for Transcutaneous Electrical Nerve Stimulation. A TENS unit sends electrical impulses through the skin (transcutaneously) to stimulate nerves and block pain signals being sent by the injury site.
Q. Why does your company require a prescription for a TENS or EMS unit and some other companies don't?

A. Some companies may not be selling authentic electrotherapy devices or their devices may not be FDA approved. When you purchase a TENS, Muscle Stim or ultrasound unit from TENSproducts, you can be assured you are getting a safe and effective device that is FDA approved, and registered. If you are ordering a TENS or EMS unit in the U.S. and are not a licensed healthcare professional, we cannot ship your device without a prescription according to Federal Law. Please see the FDA's website for more information.

Q. How do I get my prescription to you?
A. You or your doctor can fax your prescription to 1-970-887-1356 or it can be scanned and emailed to
Q. What are your shipping rates and methods?
A. TENSproducts offers FREE Standard shipping for all U.S. addresses including Alaska and Hawaii via U.S. Postal. For additional shipping methods and associated cost, including Canada and international destinations, please see Rates, Destinations, Expected Delivery Times
Q. What is your return policy?
A. TENSproducts offers a 30 day satisfaction guarantee on our products and most of our TENS and EMS units are backed with a 3 year warranty against defects (see specific item for details). We cannot accept returns on electrodes (replacement pads) due to cross-contamination risks. For full details on our return policy please see Returns
Q. Will your replacement pads fit my EMPI or Rehabilicare unit?
A. Yes. Our replacement pads fit 99% of the TENS units out there.
Q. Do you accept insurance or can you bill my insurance for me?
A. No, TENSproducts does not do any insurance billing. However, when you purchase any of our products you are provided with the paid sales receipt and the necessary CPT codes (billing codes)  to submit to your insurance company on your own behalf. If you cannot purchase out of pocket and need insurance billed, please call us at 1-866-449-1010 for a referal to one of our partner companies to handle this for you.
Q. Once I place my order how soon will it ship?
A. Most orders ship within 24 hours. Orders placed on Friday after 12 noon or on a weekend or holiday will ship the next business day.
Q. Where should I place my electrodes for pain management?
The placement of electrodes can be one of the most important parameters in achieving success with TENS therapy. However, every patient responds to electrical stimulation differently and your needs may vary from someone else's. Our electrode placement chart is a good starting point but it is safe to experiment with the placement. Once an acceptable placement has been achieved, record the electrode sites in a notebook or your TENS unit manual for future treatment. Never place electrodes on the front of the throat as spasm of the Laryngeal and Pharyngeal muscle could occur. Electrodes should not be placed over the eyes, in the mouth, internally, or such as to flow current through the heart.


Sold by Prescription or to Health Professionals only (No prescription required for Canada and International)