... indoor monitor 4: lowest price Hot color 3.5 or 4 inch TFT video door phone Model:SMT ... sensor.6 LED lights,nightvision.**handset indoor monitor,3.5 inch or 4 inch TFT,clear image.**intercommunication, ... connected with four monitors.(different choice)**four wires,DIY installation**Including in one kit:One indoor monitor, one ... (H)mm **Wiring requirements:30M: RVV4 X 0.5 mm,50M: RVV4 X 0.75 mm,100M: ...