These technologies can be grouped into three general categories: Hearing Technology, alerting devices, and communication support.
ðiːz tɛknˈɑːlədʒiz kæn biː ɡɹˈuːpt ˌɪntʊ θɹˈiː dʒˈɛnɚɹəl kˈæɾɪɡɚɹiz: hˈɪɹɪŋ tɛknˈɑːlədʒi, ɐlˈɜːɾɪŋ dɪvˈaɪsᵻz, ænd kəmjˌuːnɪkˈeɪʃən səpˈoːɹt.