The Alpha Communications/S.T.R. FSE1500 QwikBUS Series stations are designed to work as an apartment type open-voice intercom station and with Emergency signaling capabilities, using a minimal of wiring, when used in conjunction with our AlphaEntry (v3.0 or later) software and/or hardware. All FSE1500 stations in a building can be wired on only two (2) common (loop) wires! The QwikBUS system can support hundreds of FSE1500 stations on a single system. Choose from White and five (5) other decorator inspired finishes.