3.1 Controls3.1.1 DoorphoneABFEDCLens coverCamera lensLED lightsUsed to illuminate the visitor’s face or the area in frontof the doorphone so that the visitor's face can be seenin the dark.Call button and indicatorLights when the power is on for the connected mainmonitor.MicrophoneSpeakerDoorphone image qualityThe quality of doorphone images may change dependingon the installation environment, settings, lightingconditions, the time of day, etc.See page 25 for more information.3.1.2 Main monitor/extension monitorABCDEM G HIJF LKDisplay (page 11)Play lamp (blue)Lights when there is an unplayed image. Theindicator turns off when the unplayed image isdisplayed.SpeakerPlay button (M N)Press to display the image playing screen when themain monitor is idle.It can also be used as a soft key (page 10).TALK button (M N)Page button (M N)Press to page extension monitors when the mainmonitor is idle or transfer calls.It can also be used as a soft key (page 10).Unlock button (M N)Menu button (M N)Press to display the setting screen when the mainmonitor is idle.It can also be used as a soft key (page 10).OFF button (M N)Monitor button (M N)Press to monitor the outside when the main monitoris idle.It can also be used as a soft key (page 10).MicrophoneVolume button (M N)Press to adjust the ring volume when the mainmonitor is idle or when there is an incoming call.Press to adjust the receiver volume while talking ormonitoring (page 10).RESET buttonIf the main monitor cannot be correctly operated,press the MRESETN button with a pointed object toreset the main monitor. (Recorded images andconfigured settings are not affected.)93. . Preparation3. Preparation