User manual
12
Your Safety Guidelines
exposure guidelines provided that it is used with a non-
metallic accessory with the handset at least 1.5 cm from
the body, or with the original Sonim accessory intended
for this phone and worn on the body. Use of other
accessories may not ensure compliance with FCC RF
exposure guidelines.
HAC Rating
The FCC has created a rating system for cellular phones
regarding their HAC-related performance. This rating
helps consumers with hearing disabilities to nd phones
that will work well with their hearing aid devices. The
HAC rating and measurement procedure are described
in the American National Standards Institute (ANSI)
C63.19:2007.
ANSI C63.19 contains two rating standards: an “M” rating
from 1 to 4 for hearing aids operating in microphone
mode, and a “T” rating from 1 to 4 for hearing aids
operating in telecoil mode.
M-Rating stands for Microphone rating and indicates
the amount of reduction of RF interference between the
telephone and the hearing aid in acoustic coupling mode
(also called microphone mode).
Phones rated M3 or M4 meet FCC requirements and
generate less interference to hearing devices set in
microphone mode.T-Rating stands for Telecoil rating and
represents inductive coupling with hearing aids that are
operating in telecoil mode. A telecoil is a small piece of
tightly wrapped wire, built into some hearing aids. While
the microphone of a hearing aid picks up all sounds, the
telecoil will only pick up an electromagnetic signal from
the telephone. Thus, users of telecoil-equipped hearing
aids are able to communicate over the telephone without
the amplication of unwanted background noise.
Phones rated T3 or T4 meet FCC requirements and
generate less interference to hearing devices set in
telecoil mode.
A combination of M-rating and T-rating denes the
nal HAC rating and is a deciding factor in selecting
cellular phones for people with hearing problems. A HAC
compliant phone could be rated:
• M3/T3
• M3/T4
• M4/T3
• M4/T4
These ratings assist hearing device users to nd
phones that are compatible with their hearing devices.
Ratings are shown on the phone’s box or label. The
ratings are not guaranteed for suitability. The results
vary depending on the individual’s hearing loss and the
immunity characteristics of the used hearing device, i.e.
its resistance to interference. The best way to evaluate
the suitability of the phone is to try it with the intended
hearing aid device.
Sonim XP4400-A-R1 has been tested for hearing aid
device compatibility and complies with the Federal
Communications Commission (FCC) requirements. Sonim
XP4400-A-R1 is rated M3/T4.