Do you have a question about the Optimus UP-367 and is the answer not in the manual?
Indicates how much power is being fed to the line. LED shows max power point.
Controls program channel volume by turning clockwise.
Controls priority channel volume by turning clockwise.
Lights up when the priority channel is selected.
Lights up when the protection circuit is activated.
Turns the amplifier on and off when connected to a mains supply.
Uses CEE 22 plug for mains connection. Keep unit away from water.
For 24V d.c. battery connection in safety installations.