4-wire 2.5 inch color Video Door Phone

Indoor unit:
1. 4 wires connection
2. Full duplex communication
3. 2.5"TFT LCD display
4. Basic function: talk/call .monitor on/off. door opener
5. One chime only, no adjustment of volume/contrast/brightness
Outdoor unit:
1. CCD color camera
2. White LED for night vision
3. Vandal proof aluminum housing
4. IP 44 weather proof
5. illuminated name plate for showing family name
4-wire 2.5 inch color Video Door Phone