Compatible with: Interacoustics AT235/AT235h Blackline, Interacoustics AA222 blackline, Interacoustics AT235/AT235h New, Interacoustics AA222 new, Interacoustics AS608, Interacoustics AD226 New, Interacoustics AD629, Interacoustics AC40, Interacoustics AT235 blue line, Interacoustics AA222/AA220 blue line, Interacoustics Affinity 2.0, Interacoustics Equinox 2.0, Interacoustics Callisto, Interacoustics Affinity Compact, Natus-Otometrics Aurical, MAICO MA 1, MAICO MA25, MAICO MA27 (old), MAICO MA27 (new), MAICO MA30, MAICO MA33, MAICO MA40 (old), MAICO MA41/42 (old), MAICO MA41/42 (new), MAICO MA50, MAICO MA51, MAICO MA52, MAICO MA53, MAICO Pilotentest /Pilot MP3 For TDH39â„¢, 49, 50 & DD45â„¢ earphones.