Explanation of HAC Ratings.
M3 or M4
“M” refers to the device’s RF emissions level, and means the device is intended for use with hearing aids in microphone mode. The higher the “M” rating number on the device, the more likely you will be able to use the device with your hearing aid on the microphone setting.
T3 or T4
“T” refers to the device’s telecoil coupling ability, and means the device is intended for use with hearing aids in telecoil mode. The higher the “T” rating number on the device, the more likely you will be able to use the device with your hearing aid on the telecoil setting.
Tiers
- Tier 1: Texting & Camera
- Tier 2: Texting no Camera
- Tier 3: Camera no Texting