I am a hearing aid wearer in the US. What is the Hearing Aid Compatible (HAC) rating system?
A. In the US, specific hearing aid compatibility (HAC) performance ratings can help clarify how certain wireless phones and hearing aids may perform together. HAC compliant wireless phones are capable of working with hearing aids that have a minimal immunity rating of at least 2. The immunity rating indicates how susceptible a hearing aid is to picking up interference from a digital wireless phone. It can rate the performance of the hearing aid for either microphone and/or telecoil coupling. The US performance rating system for HAC compliant wireless phones that follows is also explained in the Motorola product’s user manual: The “M” (microphone) indicates that the product has been tested and rated for acoustic coupling. The “T” (telecoil) represents that the product has been tested and rated for inductive coupling. The higher the “M” or “T” rating, the less likely the hearing aid user will experience interference when the hearing aid is set to the respective microphone or telecoil mod
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