1. Menu/select: Opens, selects or exits the OSD menu. 4. Power LED: fully powered = green; sleep mode = amber;sleep timer mode = flashing amber.2. "-"/Auto: Navigates backward through the OSD menu anddecreases adjustment levels; when the OSD menu is inactive,activates the auto adjustment feature to optimize the screenimage.5. Power: Turns the monitor on or off.3. "+": Navigates forward through the OSD menu and increasesadjustment levels.ModelGP537AA