MinusNine Digital with Volume Control
The MinusNine is a miniature, inductively-coupled wireless earphone utilising an advanced digital microelectronics platform running custom software
Special functions include soft-squelch, automatic gain control and low battery alarm. It has a button encoder to scroll through 4 volume levels which also change the audio characteristics to maintain intelligibility and low levels.
The MinusNine is robust and designed to operate in hostile environments and incorporates a hygienic user-replaceable cerumen (earwax) filter system.