Compatible with: Amplivox Amplivox 240, Amplivox Amplivox 260, Amplivox Amplivox 270, GSI TympStar Pro, GSI GSI18, GSI Pello, GSI AudioStar Pro, Interacoustics TITAN Firmware & Software (IMP440), Interacoustics Titan hardware improvements (probe/SB), Interacoustics AA222 blackline, Interacoustics AA222 new, Interacoustics AA222 with insert headphones, Interacoustics Affinity 2.0, Interacoustics Equinox 2.0, Interacoustics Callisto, Interacoustics Affinity Compact, Natus-Otometrics Aurical, MAICO MA33, MedRx A2D+ Audiometer, MedRx AVANT Stealth, MedRx Avant ARC, MedRx REM Speech +, MedRx A2D+/REM+ Combo

3A medium Standard 0.54