Inside monitor: VDP-9MT Type: Handfree Power Supply: DC 15V Power Consumption: Maximum 12.3W, stand by 0.5W Working enviornment temperature: 0 ~ + 45 Working environment humidity: 45% -95% Display: 3.53 43 TFT LCD Call Signal Sound: Electronic Chime( DingDong) Picture Element: Horizontal 350 Lines, Vertical 380 Lines Maximum Wire Length: From Camera 30 meters using 0.65mm Cable Installation: Surface-mount Dimension: 195* 224* 53( mm)