Compatible with: Amplivox CA850/4, Amplivox CA850/5, Amplivox CA850/5 - Automatic, Amplivox PC850, Amplivox Amplivox 116, Amplivox Amplivox 160, Amplivox Amplivox 170, Amplivox Amplivox 240, Amplivox Amplivox 260, Amplivox Amplivox 270, GSI TympStar Pro, GSI GSI18, GSI Pello, GSI AudioStar Pro, Interacoustics AD226 New, Interacoustics AD629, Interacoustics AC40, Interacoustics AD528, Interacoustics AT235 blue line, Interacoustics AA222/AA220 blue line, Interacoustics Affinity 2.0, Interacoustics Equinox 2.0, Interacoustics Callisto, Interacoustics VIOT, 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, Black. 1 set.