The assistive listening device usually uses a microphone to capture an audio source near to its origin and broadcast it wirelessly over an FM (Frequency Modulation) transmission, IR (Infra Red) transmission, IL (Induction Loop) transmission, or other transmission methods.
ðɪ ɐsˈɪstɪv lˈɪsənɪŋ dɪvˈaɪs jˈuːʒuːəli jˈuːsᵻz ɐ mˈaɪkɹəfˌoʊn tə kˈæptʃɚɹ ɐn ˈɔːdɪˌoʊ sˈoːɹs nˌɪɹ tʊ ɪts ˈɔːɹɪdʒˌɪn ænd bɹˈɔːdkæst ɪt wˈaɪɚləsli ˌoʊvɚɹ ɐn ˌɛfˈɛm fɹˈiːkwənsi mˌɑːdʒuːlˈeɪʃən tɹænsmˈɪʃən, ˌaɪˈɑːɹ ˌɪnfɹɚ ɹˈɛd tɹænsmˈɪʃən, ˌaɪˈɛl ɪndˈʌkʃən lˈuːp tɹænsmˈɪʃən, ɔːɹ ˈʌðɚ tɹænsmˈɪʃən mˈɛθədz.