2 accessory ports that support up to 8 plug and play accessories each (maximum 16 per AZM4) App-less virtual wall controller access via QR code or distributed URL Bell Scheduler Integrated message player Room combine and groups Mono, stereo, and subwoofer support Auto noise compensation available for all zones On board WIFI to use as an access point or connect to existing Wi-Fi network Large library of AtlasIED speaker presets Accessory self-heal High Priority GPI input for integration with alarm system Wide selection of audio DSP objects