Spectrum Hygienic Keypad Master Station Compact Hygienic Keypad Master Stations provide hands-free voice communication to other master stations and substations. The station's digital signal processor instantly adjusts loudspeaker volumes to compensate for acoustically difficult locations while providing clear voice quality from anywhere in the room. Stations are constructed with a smooth mylar faceplate and equipped with a flush 16-button keypad and a two-line LCD display. The LCD display provides vital information to identify the name and number of the calling party.