The Unison Echo Expansion Bridge lets you build larger systems and add more devices while allowing you to control and configure everything from a single location. With the expansion bridge, Echo control systems can contain up to four Echo segments each with their own power supply and Echo devices. Segments support up to 16 stations or sensors and up to 16 output devices each, increasing the control system capacity to 64 stations and sensors as well as 64 output products. Each bridge may contain a maximum of 16 spaces with up to 16 zones per space. Connecting a wireless access point to the expansion bridge allows the EchoAccess mobile app to connect to the Echo control system. Multiple Echo expansion bridges can also be networked to a Unison Paradigm® control system allowing Paradigm to control individual Echo control systems.