SKYTRONIC MD-502 Mode D'emploi page 13

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Intercom function
The SkyTronic CCTV set has a built-in 2-way
intercom. The detected sound is transmitted to
the monitor via the microphone that is
incorporated into the CCD camera. The volume is
set via the 'VOL' button on the front of the
monitor. If you want to answer the call, press the
'TALK' button. The speaker in the camera will
reproduce the sound.