On November 13, 2024, the U.S. Federal Communications Commission (FCC) officially published the regulation numbered 257122 on the Federal Register website, with an effective date of December 13, 2024. The regulations specify the following requirements for 100% HAC compliance:

• By December 14, 2026, from the perspective of standard, newly certified and modified products must comply with existing HAC2019 standards. The HAC ratio requirement is still 85%;
• After December 14, 2026, the product shall:
  • should meet the volume control requirements;
  • Should comply with acoustic coupling requirements (RF emission);
  • It shall meet the T-Coil coupling requirements or Bluetooth coupling requirements, of which the T-Coil coupling requirements shall not be less than 85%, and the rest shall meet the Bluetooth coupling requirements;
• From December 14, 2026 to December 12, 2028, Bluetooth coupling can be a proprietary or universal Bluetooth protocol; After December 12, 2028, only low-power-based universal Bluetooth protocols can be used.

The regulations have indefinitely postponed the requirements for new QR code labels and the filling requirements for FORM855.

Click this link to view the original text of the regulations on 100% HAC on the federal release website.