Zone 1/L in the Audio section is the left RCA audio out. This is where your RCA Plugs goes for Music (Red 1)

The Ethernet Port is used to connect ProFusion iS to your network in order to receive configuration, content (Red 2)
and software updates.

On/Off: This is the main power switch for the ProFusion iS. This button must be in the ‘On’ position for the
ProFusion iS to operate. All functions stop immediately in the ‘Off’ position. (Red 3)