4" B/W video door phone with handset

4" B/W video door phone with handset Model:MC-528F21 FeaturesSurface-mounted , 4 inch CRT, handsetMonitor, unlockVolume/contrast/Brightness adjustable SpecificationsModelMC-528F21Display screen      4 inch CRTResolution          > 400 TV linesPanel MaterialPlasticsScan frequency      15,625Hz(H) × 50Hz(V)Power voltage       DC 16~18VVideo input         75V 1Vp-pPower consumption   1.5w ~12 wWiring mode       4 wires,polarAmbient temperature-10°C ~ 40°CDimension  (mm)     202(W)×230(H)×48(DWeight (kg) 1.26                  

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