ETC EACC-4 EchoAccess Lighting Control Interface | BlackThe ETC EACC 4 EchoAccess lighting control interface links the EchoAccess mobile app to devices on the EchoConnect system bus using Bluetooth Smart communication. Built for ETC Unison Echo environments, it gives users a practical way to access lighting functions from supported iOS and Android devices without adding a complex control layer. This makes it well suited for facilities that need mobile access to connected Echo stations, sensors, and output