LG Electronics 200C manual Amount of interference they generate, Label located on the box

SAFETY

mobile phones used by the public is 1.6 watts/kg (W/kg) averaged over one gram of tissue. The standard incorporates a substantial margin of safety to give additional protection for the public and to account for any variations in measurements.

FCC Hearing-Aid Compatibility (HAC) Regulations for Wireless Devices

On July 10, 2003, the U.S. Federal Communications Commission (FCC) Report and Order in WT Docket 01-309 modified the exception of wireless phones under the Hearing Aid Compatibility Act of 1988 (HAC Act) to require digital wireless phones be compatible with hearing-aids. The intent of the HAC Act is to ensure reasonable access to telecommunications services for persons with hearing disabilities.

	While some wireless phones are used near some
SAFETY	hearing devices (hearing aids and cochlear implants),
	users may detect a buzzing, humming, or whining
	noise. Some hearing devices are more immune than
	others to this interference noise, and phones also vary
	in the amount of interference they generate.
	The wireless telephone industry has developed a
	rating system for wireless phones, to assist hearing
	device users find phones that may be compatible with
	their hearing devices. Not all phones have been rated.
	Phones that are rated have the rating on their box or a
	label located on the box.
	The ratings are not guarantees. Results will vary
	depending on the user’s hearing device and hearing
	loss. If your hearing device happens to be vulnerable
	to interference, you may not be able to use a rated
	phone successfully. Trying out the phone with your
34	hearing device is the best way to evaluate it for your
	personal needs.

M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate less interference to hearing devices than phones that are not labeled. M4 is the better/higher of the two ratings.

T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to generate less interference to hearing devices than phones that are not labeled. T4 is the better/higher of the two ratings.

Hearing devices may also be rated. Your hearing device manufacturer or hearing health professional may help you find this rating. Higher ratings mean that the hearing device is relatively immune to interference noise. The hearing aid and wireless phone rating values are then added together. A sum of 5 is considered acceptable for normal use. A sum of 6 is considered for best use.

In the above example, if a hearing aid meets the M2 level rating and the wireless phone meets the M3 level rating, the sum of the two values equal M5. This is synonymous for T ratings. This should provide the hearing aid user with “normal usage” while using their hearing aid with the particular wireless phone. “Normal usage” in this context is defined as a signal quality that is acceptable for normal operation.

The M mark is intended to be synonymous with the U mark. The T mark is intended to be synonymous with the UT mark. The M and T marks are recommended by the Alliance for Telecommunications Industries Solutions (ATIS). The U and UT marks are referenced