... 7 inch TFT color video door phone intercom systems , Model:SMTV7I-D with Iphone7 monitorFunction and Features**plastic camera, unlock by ID ... ,by key, good design,CMOS or CCD sensor.6 LED lights,nightvision.**handfree indoor monitor,7 inch TFT,clear image ... **3-chord melody rings for option.**two cameras can connected with four monitors.(different choice)**four wires,DIY installation**Including in ...