... 2.Intercom,calling transfer 3.Anti-vandal,rainproof,night vision 4.Pin-hole door camera,1/3 CCD/CMOS Model number:VIOutdoor ... .Night viewing with IR LED.Handsfree indoor phones are optional.Pin-hole door camera is optional. Door stations technical parameters: ... Environment Temperature: -40~70° Indoor phones technical parameters: Display: 4 CRT/ 3.5'', 4'', 5'', 5.8'' & 7'' TFT-LCD Resolution: 480 ...