The Large series intercom is designed for large system capacities of up to 240 intercom master and/or remote stations, expandable up to 693 in total. You may combine masters and/or remote stations, for an intermixed system that meets your exact big system needs. This Series features an expandable central exchange. Simple, home-run wiring makes the system really easy to install. Each master station features all-call (standard), last number redial, privacy, call-back, call reply, group call (up to 2 groups), camp-on, paging capabilities, hurry-up, priority call, microphone cut-out, and remote control. For private communication, the standard master stations may be removed from their desk/wall mounting, and hand-held like a telephone, automatically cutting off the loudspeakers.