Massager vs. Medical Device — Borderline Products, and Where the Consumer-Product Zone Ends

Key takeaway — For the same massager or heat pack, the intended use you claim is what separates a consumer product from a medical device. Annex 1 of the MFDS (Ministry of Food and Drug Safety) product classification notification draws the line in its own text — the definition of the medical vibrator (A82010.01, Class 2) states that “electric massagers manufactured simply for the purpose of benefiting general health do not fall under this item,” and the medical warmer (A16150.01, Class 2) excludes “heated electric mats used for simple warmth.” Claim pain relief or muscle pain relief and the product crosses into medical device territory; use those words without registration and the prohibition on misleading advertising (Article 26(7) of the Medical Devices Act) comes into play. For this product family, the medical-device track is in large part Class 2 certification.

Same massager — so why is one a medical device?

Type “massage gun” into the search bar on Coupang and consumer products and medical devices come up mixed on a single screen. They look alike and work alike. Yet one product leads with “muscle pain relief” in large type, while another goes no further than “fatigue relief.” That difference is not a difference in marketing tone — it is a difference in legal identity.

The yardstick, exactly as covered in part 1 of this series, is not the product's materials or performance but the intended use it claims. Article 2(1) of the Medical Devices Act defines a medical device as a product used for purposes such as the diagnosis, treatment, alleviation, management, or prevention of disease; the diagnosis, treatment, alleviation, or correction of injury or impairment; or the testing, replacement, or modification of structure or function. The reason the massage and heat product family stands on the boundary so often is that “muscle pain relief” (a claim reaching the alleviation of disease or injury) and “fatigue relief” (an everyday wellness claim) sit a hair's breadth apart in consumer language.

Fortunately, with this product family you do not have to lean on abstract interpretation of the definition alone. That is because Annex 1 of the MFDS notification “Regulation on Medical Device Items and Class-by-Item Designation” (No. 2026-18) writes the consumer-product exclusions directly into the item definitions.

Medical vibrator [Class 2] — A device that applies physical energy (vibration, percussion, compression stimulation, etc.) to the human body for purposes such as the relief of minor muscle pain. Electric massagers manufactured simply for the purpose of benefiting general health do not fall under this item. — Annex 1 of the notification, A82010.01

The item table itself draws the boundary not around “the object called an electric massager,” but around what purpose it was manufactured and claimed for.

The boundary line the item table draws itself — what the original text confirms

Gather the items in Annex 1 that touch the massage and heat product family, and the boundary line draws itself into a table. The following is what can be confirmed in the original text of the notification.

Item (code · class)	Intended use on the medical-device side (item definition)	Exclusion stated in the Annex — consumer-product territory
Medical vibrator (A82010.01 · Class 2)	A device applying vibration, percussion, or compression stimulation for purposes such as the relief of minor muscle pain	Electric massagers manufactured simply for the purpose of benefiting general health
Medical warmer (A16150.01 · Class 2)	A device applying steady heat to the human body, used for purposes such as the relief of muscle pain (limited to devices with their own heat control)	Heated electric mats and similar products used for simple warmth
Hydrotherapy device (A16130.01 · Class 2)	A device with its own temperature control that pressurizes or swirls water, hot water, or steam, used for purposes such as the relief of pain	Bathtubs, half-body baths, foot baths, facial sauna devices, and the like that lack their own temperature control or are not manufactured for medical efficacy or effect
Personal warmer (A83060.01 · Class 2)	An electric warming pad used for purposes such as muscle pain relief, or to supply heat to a patient with lowered body temperature	No exclusion clause — the definition itself presupposes a medical purpose and a physician's prescription or guidance
Personal low-frequency stimulator (A83010.01 · Class 2)	A nerve and muscle stimulation device used through the skin for pain relief or the improvement of muscle atrophy	No exclusion clause — claiming pain relief or improvement of muscle atrophy is itself medical device territory

Three things can be read out of this.

First, the common denominator of the exclusion clauses is “simple.” Simply benefiting health, simple warmth, bathtubs not aimed at medical efficacy or effect — the Annex consistently carves “everyday uses with no medical claim” out of the medical device category. Put the other way around, the moment your claims cross that line, the same object walks into the item table.

Second, within what the original text confirms, these borderline items are mostly Class 2. That means they belong not to the review-free notification covered in the Class 1 series, but to certification, a procedure that includes a technical file review. For a product combining heat with low frequency, the Annex also provides combination items such as the personal combination stimulator (A83080.01, Class 2 — where the highest class among the individual functions is Class 2).

Third, the table above is not the whole of this product family. Annex 1 holds many more adjacent items, and the same product can fall under a different item depending on its principle of operation, site of use, and how the claims are phrased. How to find candidate items and cross-check them is laid out in how to check your product classification and class.

What changes when you cross the line — risk runs in both directions

The risk on borderline products cuts both ways. What you need to watch depends on which side your product stands on.

Direction ① — a consumer product making medical-device-style claims. Article 26(7) of the Medical Devices Act prohibits labeling or advertising that risks misleading people into believing a non-medical-device product has performance or efficacy similar to a medical device — and it prohibits the sale and display of products labeled or advertised that way. A violation carries, under Article 52(1), imprisonment of up to three years or a fine of up to KRW 30 million, and the two can be imposed together. Because the provision addresses “any person,” it reaches not only manufacturers but also resellers and consignment sellers; that point, together with the three common misconceptions (everyone writes it so it must be fine; the platform approved the listing so it is legal; paraphrasing gets around it), is covered in detail in part 1 of this series.

Direction ② — registering and selling as a medical device. Now the constraint flips: advertising is tied to the certified intended use. Stack an efficacy claim that is not in the certification onto a massager certified for “muscle pain relief” and medical device advertising regulation catches you again — and open-market listing pages count among the media subject to the advertising self-regulatory review system. The advertising rules that apply after registration are laid out in what you may and may not say on a listing page.

And when you choose direction ②, the procedural weight differs from Class 1. As the table above shows, the medical-device track for this product family is in large part Class 2.

	Staying a consumer product	Going Class 2 medical device
Permissible claims	Everyday uses such as fatigue relief and relaxation (no medical claims)	The certified intended use (muscle pain relief and the like)
Prior procedure	No registration procedure under the Medical Devices Act (regulation under other statutes, such as electrical appliance safety certification, applies separately)	Product certification — includes technical file review, with the business license first
Statutory fee	—	Certification KRW 130,000 (e-filing basis) + review-body fees separate
Typical lead time	—	3–4 months

The step-by-step procedure and preparation for Class 2 certification will be covered piece by piece in the coming installments of this series; the full picture of procedures, timelines, and costs by class is available first on the regulatory consulting services page.

Which side is my product on? — a three-step call

Step 1 — hold your claims against the definitions. Set the wording on your listing page, packaging, and manual (search keywords and reviews included) against the item definitions in the table above. If it goes no further than “fatigue relief, relaxation, simple warmth,” you are in the consumer-product territory the Annex excludes; if it touches “muscle pain relief, pain relief, improvement of muscle atrophy, patients with lowered body temperature,” a medical device issue arises.

Step 2 — confirm the candidate item. If you want to keep the medical-device-side claims, confirm which item in Annex 1 your product falls under. Vibration points to the medical vibrator, a heating pad to the personal warmer, low frequency to the personal low-frequency stimulator, combined functions to the combination stimulator family — but the item can change with the principle of operation and site of use, so narrowing the candidates with the search and cross-check method is the safe route.

Step 3 — choose your fork. If the medical claim is not decisive for sales, trimming the wording back into consumer-product range is the fastest resolution. If the claim is core to the business, you take the Class 2 certification track (business license plus product certification). The yardstick is the same as at Class 1 — is that wording worth the time and money the certification costs? The difference is that Class 2 runs larger than a Class 1 notification in both timeline and cost, which makes running this calculation at the sourcing and planning stage all the more important. The most frequent questions are collected in the FAQ.

What CLARE Partners does

CLARE Partners handles both the call at this fork and the execution.

• Free pre-review — send us your product information and the wording you want to use, and we return a first assessment of medical device status, the item and class, and the required procedures within one business day
• Class 2 certification service — the certification process end to end, including technical file drafting support, MFDS filing, and deficiency response, from ₩6.0M (statutory government fees itemized separately)
• Sales (rental) business notification service — document preparation and filing, from ₩0.5M
• Advertising prior review service — drafting the review application and responding to the review, from ₩0.5M (review fees separate)

The full itemized fee schedule and quotation structure are available on the regulatory consulting services page.

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On borderline products, it is not the object but the wording that decides the legal identity. Rather than fixing the copy after the listing page is finished, deciding at the sourcing and planning stage whether to go consumer product or Class 2 certification is the cheapest move. Send your product information and the wording you intend to use through a free pre-review, and we will start by confirming which side of Annex 1 you are standing on.

Legal basis: Medical Devices Act (Act No. 21263, in force 1 Jul 2026) Article 2 (Definitions) · Article 26 (Prohibited Conduct), Paragraph 7 · Article 52 (Penal Provisions) · Annex 1 of the 「의료기기 품목 및 품목별 등급에 관한 규정」 (MFDS Notification No. 2026-18, effective March 9, 2026) — based on the original texts in the National Law Information Center; item definitions and classes may change as the notification is amended. The certification fee follows [Annex 10] of the Enforcement Rule of the Medical Devices Act (e-filing basis).