For example, a phone with 26 to 40 decibel is generally sufficient for mild hearing loss, while a phone with 71 to 90 decibel is better for more severe hearing loss.
fɔːɹ ɛɡzˈæmpəl, ɐ fˈoʊn wɪð twˈɛnti sˈɪks tə fˈoːɹɾi dˈɛsᵻbəl ɪz dʒˈɛnɚɹəli səfˈɪʃənt fɔːɹ mˈaɪld hˈɪɹɪŋ lˈɔs, wˌaɪl ɐ fˈoʊn wɪð sˈɛvənti wˈʌn tə nˈaɪnti dˈɛsᵻbəl ɪz bˈɛɾɚ fɔːɹ mˈoːɹ sᵻvˈɪɹ hˈɪɹɪŋ lˈɔs.