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.
If you want to see what types of video intercom are available just click here: video intercom systems