... monitor or more monitors can support 2 camera . 4)Video talk intercom between camera & monitor 5)Talk ... 3pcs music for reference 7) Volume adjustable 8)4-wired cable for connection the camera and Monitor ... villas, appartments Why to choose 1)The Model 311 Video Door phone, large screen, provides a ... life very convenient4) Very easy installation with the 4-wired cable . good chooice for the hould being ...