Compatible with: 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 AS608, Interacoustics AD226 New, Interacoustics AD629, Interacoustics AC40, MAICO MA25, MAICO MA27 (old), MAICO MA27 (new), MAICO MA30, MAICO MA33, MAICO MA40 (old), MAICO MA41/42 (new), MAICO MA51, MAICO MA52, MAICO MA53, MAICO MA55, MAICO Pilotentest /Pilot MP3, MAICO ST20, MAICO ST32, MAICO ST26 36 For RadioEar HBA foldable audiometric headband. 1 pc.