They have five LED indicators to give a quick visual status if current is being supplied by a POE source or solar panel, if battery is charging, If load output is turned on and a warning if battery is connected with reverse polarity.
Solar and Battery Connections are via 4 screw terminals for wire size up to 12AWG. POE Input and Output is via 2 RJ45 shielded connectors. There is a secondary voltage output connector on the back with 5 screw terminals for connecting other electronics to the controller using up to 12AWG wire. The controllers are externally fused with a standard replaceable fuse.