2. Preparation62. PreparationPreparation2.1 Controls2.1.1 Main monitorBecause the main monitor receives power from the lobby station, settings can only be changed when thereare incoming calls and during calls.The switches on the side of the main monitor can be changed when the main monitor is idle.Buttons and indicators (front)No. Item DescriptionA Display —B Call indicator ( ) Flashes in red when there is an incoming call.C Talk indicator ( ) Lights in amber during a call.D Unlock indicator ( ) Lights in blue when an electric lock is unlocked.E Unlock button (M N) Can unlock electric locks when talking. (page 8)F Brightness adjust button(M N)Can adjust the screen brightness when there is an incoming call or during acall.*1R To adjust the screen brightness, press the button repeatedly to select thedesired setting from the 5 levels.G Talk/Off button (M N) (page 8)H Speaker —I Wide/Zoom button (M N) Can display images in wide mode or zoom mode (center, right, or left) whenthere is an incoming call or during a call.*1, *2R To switch between wide mode and zoom mode, press the buttonrepeatedly to select the desired setting.– Wide mode: The full camera image is displayed.– Zoom mode: Images are displayed 2 times larger than wide display.J Backlight compensationbutton (M N)Can turn the backlight compensation on or off when there is an incoming callor during a call. *1R To turn the backlight compensation on or off, select the desired setting.K Microphone —ABK NOPQL MCDE F G H I J