A TENS unit that the FDA has cleared for over-the-counter use, used the way its label says, is designed to be used at home without a prescription. That clearance is the first thing to check, and it is not a given: some of the best-known TENS units on Amazon were cleared only for prescription use, or never had their exact model cleared at all. The second thing to check is you. TENS is not safe for everyone, and the FDA’s own records spell out who should never use one.
Every unit below is named, by its exact model number, in an FDA 510(k) clearance for over-the-counter use, and every card links to that clearance so you can read it yourself. Then, and only then, it also had to be well rated by buyers on Amazon.
The short version
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Best overall
AUVON 24-Mode Rechargeable TENS Unit (TU1080)Rechargeable, 24 presets, and cleared for over-the-counter use by model number. Full review
$23.99 on Amazon Amazon Price as of Oct 31, 11:09 AM UTC -
Easiest to use
OMRON Max Power Relief TENS Unit (PM3032, sold as PM500)A few clear body-area programs and reusable long-life pads. Full review
$49.80 on Amazon Amazon Price as of Oct 31, 11:09 AM UTC -
Best for two areas at once
Belifu Dual Channel TENS EMS Unit (SM9126)Two channels, each with its own intensity, in a pocket-size unit. Full review
$29.99 on Amazon Amazon Price as of Oct 31, 11:09 AM UTC -
Best with a session timer
NURSAL 24-Mode Rechargeable TENS Unit (SM9910)A set session length, and it remembers your last program. Full review
$25.99 on Amazon Amazon Price as of Oct 31, 11:09 AM UTC -
Best for gentle intensity steps
AVCOO 3-in-1 TENS Unit (TS2301)Forty intensity levels, two channels, and a screen that shows which body area you chose. Full review
$25.98 on Amazon Amazon Price as of Oct 31, 11:09 AM UTC
Right now these picks show only to readers in the US. We could not check amazon.co.uk listings when we researched this guide, and we only list a store we have checked. We will add UK listings once we have matched them model by model.
What “cleared for over-the-counter use” means
The FDA has a specific category for home TENS units: product code NUH, “stimulator, nerve, transcutaneous, over-the-counter.” Its definition is narrow: “temporary relief of pain due to sore/aching muscles.” That is what the clearances below cover, usually worded as relief of pain from sore and aching muscles in the shoulder, back, neck, arms and legs “due to strain from exercise or normal household work activities.” One of our picks, the NURSAL, is also cleared over the counter for chronic pain and arthritis pain.
Three things trip people up:
- Many units are TENS and EMS combined. EMS (electrical muscle stimulation) programs are cleared “to stimulate healthy muscles in order to improve and facilitate muscle performance.” They are not pain relief programs, so check which program numbers are TENS in the manual.
- “FDA cleared” on a listing is not proof. Clearances name model numbers, and brands sell near-identical units under several. We matched the model number on every Amazon listing below to the one named in the clearance.
- Some clearances are for prescription use only. A TENS unit cleared that way can be sold, but its clearance does not cover use without a prescription.
You can check any unit yourself in the FDA 510(k) database: search by product code NUH or the company name, open the entry, and look for the model number and the “Over-The-Counter Use” box on the indications page.
Who should not use a TENS unit
This is the most important part of the guide. The FDA’s published summary for OMRON’s Max Power Relief gives the contraindication that over-the-counter TENS units carry:
Do not use this device if you have a cardiac pacemaker, implanted defibrillator, or other implanted metallic or electronic device. Such use could cause electric shock, burns, electrical interference, or death.
The NHS says not to use TENS if you have epilepsy or a pacemaker, and not to use it if you are pregnant unless your doctor or midwife tells you to. It also says that if you are not sure what is causing your pain, see a healthcare professional before using a TENS machine.
OMRON’s cleared instruction manual adds more, in its own words:
- Do not use on pregnant women, or on children or infants, “because this device has not been evaluated for pediatric use.”
- If you have suspected or diagnosed heart disease, or epilepsy, follow the precautions your doctor recommends.
- Do not use it with another TENS device, or with a life-supporting electronic device such as an artificial heart or lung.
- Consult your doctor before using it. The manual warns the unit “may cause lethal rhythm disturbances in certain susceptible individuals,” and that after recent surgery, “the stimulation may disrupt the healing process.”
- Use caution if you tend to bleed internally, such as after an injury or fracture.
Where the pads must never go
From OMRON’s manual, with the NHS saying the same about the neck, face, broken skin and chest:
- The head, mouth or any part of the face, or near the eyes.
- The neck or throat, which the manual says “could cause severe muscle spasms resulting in closure of the airway, difficulty in breathing, or adverse effects on heart rhythm or blood pressure.”
- Across the chest, or on both sides of the chest at once (front and back, or side to side), because the current “may cause rhythm disturbances which could be lethal.” Not near the heart, and not on the genital area.
- Both calves at once, or the soles of both feet at once, which may cause cardiac disturbance.
- Broken, irritated or numb skin: open wounds, rashes, swollen, red, infected or inflamed areas, varicose veins, on or near cancerous lesions, or skin that lacks normal feeling. The NHS says the same about numb skin.
Using one safely
- Never in the bath or shower, while asleep, or while driving or using machinery. Both the NHS and OMRON say this.
- Start low. The NHS advice is to leave a gap between the pads and turn the intensity up slowly until you feel a tingling, not pain.
- Read the leaflet that comes with the unit; the NHS says this too, and the pad placements and program numbers differ between units.
- Watch your skin. If it becomes itchy, red or irritated, the NHS says to turn the machine off and remove the pads.
- Know when to stop. OMRON’s manual says that if your pain does not improve, becomes severe, or lasts more than five days, stop using the unit and see your doctor.
It is also worth being clear about what TENS does. The NHS says it is “thought to work” by reducing pain signals and releasing endorphins, and that it “does not work for everyone.” OMRON’s manual puts it bluntly: TENS “is not effective in treating the original source or cause of the pain.”
The picks
AUVON 24-Mode Rechargeable TENS Unit (TU1080)
A rechargeable TENS and EMS unit with 24 preset programs and two lead wires. The TU1080 is named in an FDA 510(k) clearance for over-the-counter use, for temporary relief of pain from sore and aching muscles caused by exercise or normal household work, with separate EMS programs for stimulating healthy muscles.
- Model
- TU1080
- Programs
- 24 (TENS and EMS)
- Power
- Built-in rechargeable battery, up to 10 hours per charge (maker)
- Charging
- USB-C cable and wall charger, about 1 hour
- In the box
- Unit, 8 pads, 2 lead wires, pad holder, pouch
The proof: FDA 510(k) K242787 (OTC)
Best for
A first TENS unit that recharges instead of eating batteries, with enough presets to find one that suits you.
Worth knowing
AUVON sells several similar-looking units. Only the TU1080 is linked here; check the model number on the listing and the box. The EMS programs are for muscle performance, not pain relief.
AUVON’s TU1080 is one of the most bought TENS units on Amazon, and its model number is named in an FDA clearance for over-the-counter use. It recharges in about an hour rather than running on batteries, and its 24 presets are grouped under six main modes, which makes them easier to work through than a long numbered list. AUVON sells several lookalike units, so check that the listing and box say TU1080.
OMRON Max Power Relief TENS Unit (PM3032, sold as PM500)
A small, battery powered TENS unit from OMRON with a short list of body-area programs and long-life reusable pads. The FDA cleared the Max Power Relief, model PM3032, for over-the-counter use in 2014 (K141978), and OMRON's later clearance K182120 confirms the PM3032 is the model cleared there.
- Model
- PM3032 (retail name PM500)
- Session
- 15 minutes, up to 30 minutes 3 times a day (maker)
- Pads
- 2 long-life pads, washable and reusable
- Power
- 2 AAA batteries, included
- In the box
- Unit, 2 pads, pad holder, electrode cord, batteries, manual, pad placement guide
The proof: FDA 510(k) K141978 (OTC) FDA 510(k) K182120 summary, naming the PM3032
Best for
Anyone who wants a few clear choices rather than dozens of programs, from a well-known medical device maker.
Worth knowing
The box and manual call it the PM500; the FDA clearance and the Amazon listing use OMRON's model number, PM3032. It runs on 2 AAA batteries and comes with one pair of pads.
OMRON’s Max Power Relief has a short menu of programs by body area, a 15-minute session, and pads that OMRON says last about 150 uses with washing. Its FDA clearance is one of the oldest here, and OMRON’s later 510(k) summary, the one quoted in the safety section above, confirms the PM3032 is the model cleared. The box says PM500; that is the same unit. It runs on AAA batteries and has a single pair of pads.
Belifu Dual Channel TENS EMS Unit (SM9126)
A pocket-size, rechargeable TENS and EMS unit with two independent channels, 24 programs and 20 intensity levels. Its maker, Hong Qiangxing, holds the FDA 510(k) clearance for the SM9126, cleared for over-the-counter use: TENS for temporary relief of sore and aching muscles, and EMS for stimulating healthy muscles.
- Model
- SM9126
- Channels
- 2 (A and B), each with its own intensity
- Programs
- 24, with 20 intensity levels and a timer
- Power
- Built-in rechargeable battery, USB charging
- In the box
- Unit, 10 pads, lead wires, storage bag
The proof: FDA 510(k) K220150 (OTC)
Best for
Treating two sore areas at once, with a separate intensity for each.
Worth knowing
Only some of its 24 programs are TENS programs for pain; the rest are EMS programs for muscle performance. The manual lists which is which.
Two independent channels mean you can place one pair of pads on your lower back and another on your shoulder, with a different intensity for each. The SM9126 is small enough for a pocket and recharges over USB. Of its 24 programs, some are TENS for pain and the rest are EMS for muscles, so keep the manual handy.
NURSAL 24-Mode Rechargeable TENS Unit (SM9910)
A rechargeable TENS and EMS unit with two outputs, 24 programs, 20 intensity levels and a session timer. The SM9910 is named in an FDA 510(k) clearance that covers over-the-counter use for temporary relief of sore and aching muscles, and for symptomatic relief and management of chronic, intractable pain and relief of pain associated with arthritis.
- Model
- SM9910
- Programs
- 24 (TENS and EMS), 20 intensity levels
- Timer
- 10 to 60 minutes, 20 minutes by default
- Extras
- Remembers the last program; screen lock
- Power
- Built-in rechargeable battery
- Outputs
- 2, for two areas or two people
- In the box
- Unit, 8 pads, lead wires, pad holder
The proof: FDA 510(k) K233092 (OTC and prescription)
Best for
Someone who wants a set session length and the unit to remember their last program.
Worth knowing
As with most combo units, the EMS programs are for muscle performance, not pain. The clearance also covers prescription uses; buying it over the counter covers only the OTC uses listed.
The NURSAL lets you set a session from 10 to 60 minutes, remembers the program you used last, and locks the screen so you cannot bump the intensity by accident. Its clearance is broader than most: as well as sore muscles, it covers over-the-counter use for chronic, intractable pain and pain associated with arthritis.
AVCOO 3-in-1 TENS Unit (TS2301)
A rechargeable TENS, EMS and massage unit with two channels, 30 programs and 40 intensity levels, and a body outline on the screen that lights up the area you choose. The TS2301 is named in an FDA 510(k) clearance for over-the-counter use, for temporary relief of pain from sore and aching muscles, with EMS programs for stimulating healthy muscles.
- Model
- TS2301
- Channels
- 2 (A and B)
- Programs
- 30 (TENS, EMS and relax), 40 intensity levels
- Power
- Built-in rechargeable battery, up to 40 hours of use (maker)
- In the box
- Unit, 12 pads in several shapes, lead wires
The proof: FDA 510(k) K250759 (OTC)
Best for
Anyone who finds TENS uncomfortable at first and wants to raise the intensity in small steps.
Worth knowing
Only the TENS programs are for pain; the EMS and relax programs are not. AVCOO sells other 3-in-1 units; check the listing and box say TS2301.
If the first tingle of a TENS unit puts you off, the AVCOO’s 40 intensity levels let you turn it up in smaller steps than most. The screen shows a body outline and lights up the area you pick, and two channels let you treat two spots at once. It mixes TENS, EMS and relax programs, so check the manual for which are which.
What did not make the list
- TENS 7000 (the classic model). It is one of the best-selling TENS units on Amazon, and its listing calls it OTC. But the only FDA clearance we found that names it, from 2008, is for prescription use.
- TENS 7000 Rechargeable. A unit by that name is cleared for over-the-counter use, but the Amazon listing gives a different model number, so we could not match the two.
- Beurer EM59. An “EM59” is cleared, but the clearance is held by another company and does not mention Beurer, so we could not confirm it is the same unit.
- Comfytemp and AUVON wireless units. Their makers hold over-the-counter clearances, but the Comfytemp clearance names its part number (K6122) rather than the model on the listing (JPD-ES100), and the AUVON clearance names no model at all. That leaves no wireless pick for now.
- Etekcity, NueMedics and TENKER units. All are well rated, but we found no clearance naming the models on their listings.
The safest TENS unit is one cleared for over-the-counter use, in the hands of someone without a pacemaker, implanted device, epilepsy or pregnancy, with the pads kept off the neck, head and chest. If you are not sure what is causing your pain, the NHS advice is simple: see a healthcare professional first.