a rated mobile device successfully. Trying out the mobile device withyour hearing device is the best way to evaluate it for your personalneeds.M-Ratings: Wireless mobile devices rated M3 or M4 meet FCCrequirements and are likely to generate less interference to hearingdevices than mobile devices that are not labeled. M4 is the better/higher of the two ratings. M-ratings refer to enabling acousticcoupling with hearing aids that do not operate in telecoil mode.T-Ratings: Mobile devices rated T3 or T4 meet FCC requirements andare likely to generate less interference to hearing devices thanmobile devices that are not labeled. T4 is the better/higher of the tworatings. T-ratings refer to enabling inductive coupling with hearingaids operating in telecoil mode.Hearing devices may also be rated. Your hearing aid manufacturer orhearing health professional may help you find this rating. Higherratings mean that the hearing device is relatively immune tointerference noise.Under the current industry standard, American National StandardsInstitute (ANSI) C63.19, the hearing aid and wireless mobile devicerating values are added together to indicate how usable they aretogether. For example, if a hearing aid meets the M2 level rating andthe wireless mobile device meets the M3 level rating, the sum of thetwo values equals M5.Under the standard, this should provide the hearing aid user withnormal use while using the hearing aid with the particular wirelessmobile device. A sum of 6 or more would indicate excellentperformance.Health and Safety Information 180
