High-tech 7 inch water color LCD screen with speaker and without earphone - CDV-71AM
 Advantages 
 7 inch TFT LCD screen, enables video chatting
 Door lock release (single and general entrance)
 Support 2 monitor, camera and 2 intercom switchable PAL/NTSC
 Video monitoring with expandable PIP (Picture-in-Picture) feature
 Can be connected to 2 monitors with 2 CCTV cameras and 2 door cameras
 Built-in memory stores up to 128 cut photos
 Specifications 
 a model :  CDV-71AM
 Brand :  commax
 energy :  AC 100-240V, 50/60Hz
 the wire :  Door camera: 4 wires(Polarity) Interphone: 4 wires(Polarity) CCTV camera: 2 wires(Polarity)
 Operating temperature:   0℃~40℃