Compatible with: GSI TympStar Pro, GSI GSI18, GSI Pello, GSI AudioStar Pro, Interacoustics TITAN Firmware & Software (IMP440), Interacoustics Titan hardware improvements (probe/SB), Interacoustics AT235/AT235h Blackline, Interacoustics AA222 blackline, Interacoustics AT235/AT235h New, Interacoustics AA222 new, Interacoustics AA222 with insert headphones, Interacoustics Affinity 2.0, Interacoustics Equinox 2.0, Interacoustics Callisto, Interacoustics Affinity Compact, Natus-Otometrics Aurical, MedRx A2D+ Audiometer, MedRx AVANT Stealth, MedRx Avant ARC, MedRx A2D+/REM+ Combo Includes adaptor nipples. Bag/4 pcs.