Features: 1) Direct calling and dual talking hands free, real time monitoring, and remote Unlocking 2) 4 inside monitors available for one door station with interphone 3) Image taking and recording with 32 pictures available by extra image recorder 4) Ten kinds of music optional, automatically showing status, such as recording Picture, being busy and out 5) CCD color, CMOS color available Specifications (outside camera): 1) Resolution: CCD 420 TV line, CMOS 380 TV line 2) View angle: CCD 92, CMOS 78 3) Lowest luminance: 0.02 lux 4) Power source: From monitor 5) Power consumption: 2W 6) Dimensions (H x W x D): 140 x 120 x 30mm Specifications (inside monitor): 1) Screen: Color 4" / 5.6" TFT LCD 2) Talking way: Hands free 3) Power source: AC 110-240V 4) Power consumption: A) Standby: 0.5W B) Operation: 10.5W 5) Dimensions (H x W x D): 220 x 262 x 70mm