iSTIMTens Unit Stimulator Machine - EV820 with 8 Electrodes Japanese Gel for Pain Management, Back Pain and Rehabilitation

After having used an expensive TENS unit ordered, at my request, by my doctor after a major surgical procedure in 2008, I was amazed at the amount of pain it controlled right from the start in the recovery room. I was given Toradol for the first two days. After that, I was able to use just Tramadol for a few days, and then alternated between Tylenol and Advil when needed for only about another week when I went home. I never needed serious pain medication, which I wanted to avoid. I DO have a high pain tolerance, which convinced my doctor to at least try the TENS unit. It was wonderful!I don't have chronic pain, but I do have the tendency to stress lower back muscles, shoulder and neck muscles, and occasionally my knee, which has had three ligament surgeries. I never thought a TENS unit was affordable until I saw one featured here on Amazon. I then researched all the units offered on Amazon, and the iStim EV-820 had the best overall reviews from customers using it for more serious issues than mine. I decided to try this unit.I used it for the first time last night on the left side of my neck and my left shoulder, which were tight and sore from lifting things I shouldn't have been lifting. I read the manual thoroughly, and having used a TENS unit, I knew that the increase in stimulation has to be gradual to get to the level I could tolerate. Everyone one is different and tolerates different levels of stimulation. The manual recommendations are not a be-all for every user.Since I had some experience with a TENS unit, I did not pre-set the unit to the recommended level, but after adhering the electrode pads in the recommended places (which I later adjusted with no difficulty), I turned the dial and dialed up slowly to get just enough stimulation to determine which mode I wanted to use. Once the mode I desired was selected, then I increased VERY slowly the stimulation.I felt that the instructions, complications, warnings, and placement diagrams were clear, precise, and thorough. Every technology has a learning curve, and it is the responsibility of the consumer to read very carefully and ask questions if not sure about how to use any TENS unit.It was perfect for my specific need last night. I went to bed ache-free and slept well after a 30 minute treatment, a break, and another 30 minute treatment. I am glad I decided to try this unit, and I feel confident that future use will result in reduced, less potent medication or medication-free pain relief.

This is my first TENS machine to help with my muscle pains from work. For people not sure what this machines does Transcutaneous Electrical Nerve Stimulation is a non-invasive method of controlling pain by using tiny electrical impulses sent through the skin to nerves to modify pain perception which reduce or eliminate pain sensation for a short period of time. It does not fix the actual physiological problem.This Unit comes with everything you need to get started: a control unit, a battery, 2 lead wires, 8 electrode pads, instruction manual, and a electrode placement guide. Just follow through the instruction manual the unit is not hard to use even if you have never used one before.I used it for a few days with just 10-15 min each session. I noticed a relieve in intensity of pain after the sessions. It usually lasted for a few hours before the pain came back. I assumed by using a longer session the pain relief will last longer. Also during the second session I used lotion on my arm right before I used the TENS unit and forgot to clean skin and the electrodes gel lost adhesiveness. Next day the electrodes still stayed on but not as good as before. So before you place electrodes on your body make sure to clean it first as directed.

Product is sound, comes with a convenient case to keep wires and unit straight, even came with a 9v battery. Unit has covers that close over buttons and knobs on the unit to prevent unintentional setting changes. Stronger settings on the unit are extremely strong. Comes with good pads in the box and really leaves no room for complaint about the quality of the device. Shipping was Prime so it was very fast and free. Packaging was easy to open. Instructions were clear with helpful illustrations.Very pleased with the unit. Please note I do not address the value or effectiveness of this therapy in this review, but the machine is of excellent quality and function.

This unit has mostly everything I wanted: a replaceable battery, a clip, a cover of the buttons and knobs, least amount of digital parts to break, no time limit, two channels, leads (the sticky patches) that insert INTO the wires, and multiple settings to choose from. While the A/B channel settings are coordinated (B does what A does), it's nice to stimulate two different areas or compound the stimulation to one area. Also, the intensity levels of each channel are separate from the other (B channel can go higher, lower, or the same as A channel). I took one star away because I had to use a higher intensity level on this one (versus the 3000 unit from a different brand). I did also test a digital LED display, rechargeable lithium battery device - this "basic" unit was more effective for my pain, as I had more options to personalize, but these wires did fit into the "smart" unit (if needed for future updates). Overall, this will not cure me but it helps me get through the workday lifting patients.

The product is easy to set up. Has 2 ports. 2 sets of pads that can be reused. Works great.

I bought this in August 2021 (now 2 years) And couldn't recommend it more! I got this for my tendonitis in my left shoulder and the spasms I have in my back. I used the ICY HOT Smart Relief TENS for years but they were discontinued, they worked great but this unit allows so much more control and positioning of the electrodes! The unit itself has much better control over the current, voltage, and patterns of cycles.