... intercom when you press "Talk" key on other monitor, press "Talk" key on local monitor to finish.5. Adjust Brightness, Contrast and ... Medium, Small) can be chosen. Press " Indoor Call key" for 5 seconds, click "Monitor key " to select the volume, then, click "Indoor Call ... are 3 melodies can be chosen. Press "Monitor key" for 5 seconds, click "Indoor Call key" to select the melody, then, click " ...