GreatCall Jitterbug How-To Manual page 166

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
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
Health and Safety Information 155