The choice of a video intercom comes down to your budget and the
features you need that fit that budget.
Some video intercoms have a picture memory that stores snapshots of
visitors at your door for security purposes. High-end systems have
features like camera pan/tilt/zoom, wide-angle view that enable you to
see multiple people standing at the door.
If choosing a wireless video intercom note that the range listed is
line-of-site, which means that you can see between the door unit and the
monitor. When you add walls or other obstructions, this range will drop
significantly so don't count on getting the range listed.
If you need help determining which system is right for you, you can
always call and ask to talk to one of our product experts to help you
pick the right one.
For some good reasons to buy a video intercom also see this article:
Why Do You Need A Video Intercom Door Phone?