21 C.F.R. § 800.30
(b) Definitions for the purposes of this section. This section uses the following definitions:
Air-conduction hearing aid. An air-conduction hearing aid is a hearing aid that conducts sound to the ear through the air.
Hearing aid. A hearing aid is any wearable device designed for, offered for the purpose of, or represented as aiding persons with or compensating for, impaired hearing.
Licensed person. A licensed person is a person as defined in section 201(e) of the Federal Food, Drug, and Cosmetic Act that holds a license or degree for the diagnosis, assessment, or treatment of hearing loss; or that holds a license to sell or distribute hearing aids. A person that must meet generally applicable licensing or operating requirements such as annual health and safety inspections, provided the generally applicable licensing or operating requirement is consistent with this section and other applicable requirements under the Federal Food, Drug, and Cosmetic Act, is not a “licensed person” solely for that reason. A person that represents as a marketer, seller, dispenser, distributor, or customer support representative (or an equivalent description) is not a “licensed person” solely by making such representations.
Over-the-counter hearing aid. An over-the-counter (OTC) hearing aid is an air-conduction hearing aid that does not require implantation or other surgical intervention, and is intended for use by a person age 18 or older to compensate for perceived mild to moderate hearing impairment. The device, through tools, tests, or software, allows the user to control the hearing aid and customize it to the user's hearing needs. The device may use wireless technology or may include tests for self-assessment of hearing loss. The device is available over-the-counter, without the supervision, prescription, or other order, involvement, or intervention of a licensed person, to consumers through in-person transactions, by mail, or online, provided that the device satisfies the requirements in this section.
Prescription hearing aid. A prescription hearing aid is a hearing aid that is not an OTC hearing aid as defined in this section or a hearing aid that does not satisfy the requirements in this section.
Rebuilt hearing aid. An OTC hearing aid is “rebuilt” if the manufacturer has inspected and tested the device, made any necessary modifications to ensure it meets applicable regulatory requirements, including the requirements in this section to be available OTC, and adequately reprocessed the device for the next user.
Sale. Sale includes a lease, rental, or any other purchase or exchange for value.
Tools, tests, or software. Tools, tests, or software are components of the device that, individually or in combination, allow a lay user to control the device and customize it sufficiently, such as the device's output, to meet the user's hearing needs.
Used hearing aid. A hearing aid is “used” if a user has worn it for any period of time. However, a hearing aid shall not be “used” merely because a prospective user wore it as part of a bona fide hearing aid evaluation to determine whether to select that particular hearing aid for that prospective user. A hearing aid evaluation is “bona fide” if it was conducted in the presence of the dispenser or a hearing health professional selected by the dispenser to assist the prospective user in making a determination.
(c) Labeling. An OTC hearing aid shall bear all of the following in the labeling:
(1) Outside package labeling. The outside package of an OTC hearing aid shall bear all of the following:
(i) Warnings and other important information. All of the following shall appear on the outside package:
(A) (A) Warning against use in people younger than 18.

(B) Symptoms suggesting perceived mild to moderate hearing loss.

(C) Advice of availability of professional services.

(D) “Red flag” conditions.

(E) Notice of contact information.

(F) Notice of manufacturer's return policy.

(2) Labeling, inside the package. The manufacturer or distributor of an OTC hearing aid shall include a user instructional brochure inside the package and shall make an electronic version available for download without site or customer registration and without requiring purchase of any product or service. The user instructional brochure shall include all of the following:
(i) The following warnings, which shall appear in the following order and prior to any content except the cover page:
(A) Warning against use in people younger than 18.

(B) “Red flag” conditions.

(C) Warning about pain from device placement.

(iii) The following cautions and notices for users, which shall appear prior to any content except the cover page and the warnings under paragraphs (c)(2)(i) and (ii) of this section:
(A) Caution about hearing protection.

(B) Caution about excessive sound output.

(C) Caution about components lodging in ear.

(D) Advice to seek professional services.

(E) Note about user expectations.

(E) Note about reporting adverse events to FDA.

(vii) Specific instructions for all of the following:
(3) Labeling on the device. The labeling on an OTC hearing aid itself shall bear all of the following clearly and permanently, except as provided in paragraph (c)(3)(iii) of this section:
(4) Technical specifications. All of the following technical specifications shall appear in the user instructional brochure that accompanies the device. You may additionally include it on the outside package:
(5) Software device labeling. OTC hearing aid software that is not distributed with the hearing aid or amplification platform shall meet all of the following labeling requirements. With respect to the information required under paragraphs (c)(1) through (4) of this section, the information must be provided in the software device labeling, as specified in paragraphs (c)(5)(i) through (v) of this section, rather than the locations (e.g., outside package labeling) specified in paragraphs (c)(1) through (4):
(i) Prior to first use of the software or obtaining payment information for the software, whichever occurs first, the labeling must clearly and prominently present all of the following to the prospective user. For each, the labeling must remain visible until the user dismisses it or proceeds to the next step:
(ii) Prior to first use of the software, the labeling must clearly and prominently present all of the following to the prospective user:
(d) Output limits. The output limit for an OTC hearing aid shall be the device maximum acoustic output sound pressure level (SPL) with an acoustic coupler as described in paragraph (e)(6) of this section when the device input is a 90 dB SPL pure-tone, and the gain/volume control is full on. An OTC hearing aid shall not exceed the following limits at any of the frequencies at which the device is intended to operate:
(e) Electroacoustic performance limits. An OTC hearing aid shall perform within all of the following electroacoustic limits. Measure each electroacoustic performance characteristic using an acoustic coupler as described in paragraph (e)(6) of this section, where applicable:
(1) Output distortion control limits. Test the output distortion of the OTC hearing aid as follows to ensure that it does not exceed the limit specified in paragraphs (e)(1)(i) through (iii) of this section.
(i) The total harmonic distortion plus noise shall not exceed 5 percent for output levels within one of the following sets of levels, depending on the test method:
(6) Acoustic coupler choice. Where applicable, use one of the following acoustic couplers to measure electroacoustic performance:
(f) Design requirements. An OTC hearing aid must conform to all of the following design requirements:
(g) Conditions for sale of an OTC hearing aid. The sale of an OTC hearing aid is subject to all of the following conditions:
(h) Effect on State law. Any State or local government requirement for an OTC hearing aid is preempted to the following extent:
[87 FR 50748, Aug. 17, 2022]