... Video intercom system Model No#:SMT-520C-4New bule, red, white 7 inch LCD TFT One camera to 4 monitors Feature:1) ... camera3) Clear Dual-way audio communication4) Use 380 lines CMOS image sensor5) Hand free intercom, clear voice6) Unlock the ... degree, working humidity: no more than 85%. Specification:CAMERAMONITORLens1/4 CMOSMonitorBlue, white, red,silver 7 inch color TFTResolution380 LinesResolution960* ...