Magnum Energy ME-RTR Router Control, LED Indicators, LCD Display, ON/OFF Pushbuttons, PORT Button, CTRL Button, METER Button, SETUP Button, TECH Button, Rotary Knob/SELECT Button LCD Display: The LCD display is a 20 x 4 line (80 characters total) alphanumeric display used for setting up the inverter/charger operation, as well as viewing current status or fault messages ON/OFF Pushbuttons (x2): Allows all the inverters or chargers to be quickly enabled or disabled SETUP Button: This button is used to access the setup menus for the inverter, charger, AGS, and BMK. The SETUP button may be password protected to keep unauthorized users from accessing the SETUP menus TECH Button: This button is used to access technical information, fault history, and to set a password for the SETUP button Rotary Knob/SELECT Button: The rotary encoder knob is similar to a dash radio knob and is used to quickly scroll through Ports 1-6, or to select various menu items and settings. Pressing this rotary knob allows you to select a menu item or to save a setting, once it is displayed on the LCD screen