If you use Microphone: Look for Cell Phones Rated M3 or M4

If you use Microphone:
Look for Cell Phones Rated M3 or M4

Phones that are compatible (low interference) with aids in microphone mode will be classified M3 or M4.
- The higher the number, the more likely it is you will experience little or no interference
Phones that have more emissions have a lower rating M1 or M2 but these will not be labeled.
- They do not meet FCC requirements for HAC