· feedback risk management for reduction of acoustic feedback · variable crossover frequency · special digital fitting philosophy based on keyed in audiometric values · optional digital volume control on full and half shell models ± 6 db range with beep-tone adjustment indicator · m mt and t settings available with beep-tone indicator the telecoil frequency response is equalized to that of the microphone · long battery life of approximately 200 hours · low battery beep-tone indicator · minimal audible internal noise due to special processing wide dynamic range compression wdrc the wdrc system used ...