8'' Color LCD Screen Wired Video Doorbell Intercom System with Camera for Home Door Phone Kit (2 Indoor Monitors)Product Description ... )5, Handfree intercom,max combination: 1-2 outdoor unit with 1-4 indoor unit6, Electric lock-control function,support MAX ... 750TVL CMOS Camera8, 11kinds of rings for your options.9, Volume, brightness & contrast adjustable.10,With adapter and cable, users could ...