CR450C color video door phone 3.5" color TFT-LCD panel. Cable connection, wall or table mount installation. Handfree intercom,clear voice. Ring indicates the visitor's coming. Auto extend shut off when nobody answers. Support multi-indoor power output. Alarming function. Lock-control power output. Monitor what happens outside. Dimension:56.5*34*24.8CM 6PCS/CTN 3714PCS/20FT 7488PCS/40FT 8748PCS/40FT HQ Size: 78*105*28mm 107*161*42mm