... /monitor,security product,video intercom.Features DIY system with PLUG & PLAY connection.Up to 4 door ... aluminium, surface mount.Night viewing with IR LED.Handsfree indoor phones are optional.Pin-hole door camera is optional. ... CRT/ 3.5'', 4'', 5'', 5.8'' & 7'' TFT-LCD Resolution: 480×234(3.5'')/960×234(4 ... '',5'',5.8'')/1440×234(7'') pixels Working Voltage: DC18V±10% Working Current: ...