IF 4K digital interferential Dual Channel 6 modes

I was not happy with all the other units that I purchased. Started using one of the first Tens 40 years ago, f .!aoso I have been around the block. Purchased this IF unit 1 and half years ago. I was so happy I purchased another one. The patches are truly laytex free and have weeks of use if you are careful. The leds are nice and thick lasting months. Best of all 4 AA batteries last days. This unit is bigger than most but is is built to last. Have dropped mine many times still working. Last the company is great to work.

Over the last 5 years, I bought this TENS unit and two other units. The two other units claimed to be interferential:1) IF 4K™ digital interferential Dual Channel 6 modes by Koalaty Products2) IF-4000 Analog Portable Interferential PN# KOA-IF4000 by IF-4000I compared the units directly, by leaving the electrode pads in the same place and swapping the leads between the units, which takes only a few seconds, as the electrode pads have connections within 4 inches of the the pad itself. I gave the TENS 7000 4 stars, the IF-4000 3 stars, and the Koalaty unit 1 star.You will find both TENS and interferential units at a rehabilitation business. Proffesional TENS units are inexpensive, 30–100$. Professional Interferential units cost between 1500 and 6k$. The Koalaty control keys and patterns worked beautifully, but the signal was so weak, it was incapable of introducing any changes to the my muscles in chronic spasm. The IF-4000 had no controls other than frequency and signal strength.Of the three units I bought, the TENs 7000 works the best. If I was to make my choices again, I would not bother with the Koalaty unit. The IF-4000 does have a strong enough signal to work to find smaller deeper muscles, it does feel different than the TENS 7000, but I'm still not sure the IF-4000 is interferential, it lacks the signal strength to make a direct comparison.The TENS 7000 has a strong signal and its controls work well. Like any TENS unit, it can be painful at the pad or needle location, or when it lights up a nerve. True interferential units can get deeper with less pain. I do not know the difference in electrical signal which makes one unit TENS and one unit interferential. I experience both in a professional setting as much as twice a week (for 4 years now).I might buy IF-4000 again. It does feel different when used in the same location and time. The frequency controller on the IF-4000 did not work. The IF-4000 has enough signal strength, but its signal strength varies from moment to moment, it has less signal strength than the TENS 7000, and I'm not sure the IF-4000 is really interferential, even now. The signal strength of the IF-4000, while adequate to stimulate deeply located muscles is not strong enough to make a direct comparison to the TENS 7000 and make a guess whether the IF-4000 is actually interferential.The Koalaty controls are excellent, but its signal strength is so weak as to be useless to me for my worst muscle spasm problems, barely useful for large muscles close to the surface, and it is twice the price of the other two units. Like the IF-4000, I am still not sure that the Koalaty unit is interferential. Its signal strength is so weak, there is no way to compare the unit to the IF-4000 or the TENS 7000. You have to feel them at roughly the same (high) intensity to know. The Koalaty unit is also more than double the price of the TENS 7000 and the IF-4000. The problems I have are in muscles around beneath my spine and among the secondary breathing muscles rather than at the surface. I have make the pads small, and push them deep and hold them there to get access to the right muscles. The Koalaty unit just lacks the signal strength for that. I would not bother with this unit.

didn't have the power needed to relax my muscle problem. My old TENS unit does a better job for me.

Bought for my husband with chronic back pain at the recommendation of his physical therapist. He loves it and says it really helps with his back pain!

Easy to operate and works well. Doesn’t last long with batteries but power cord is included.

Exactly the product I was searching for.

Love this. It is our second one, we use it all the time.

This is a great unit- battery or AC operated- choice of impulse strength and settings. I use mine for chronic low back pain and it works so well that I ordered another unit for a family member to use. I find it much better than a TENS unit. WARNING- Since providing this review I have learned that this company no longer exists. I have not been able to order a replacement charging cord for my unit. I am down-grading this product to 3 stars.