Video Intercom System

Any help would be appreciated.

I'm looking to purchase a new video intercom system (with door unlock) and could use some help. It'll be for a school/church building for letting people into the building. There's an existing system which has one monitor but the video function doesn't work anymore and it's not expandable.

The new system would be have two monitors and be preferably wireless.

I've been researching them and there doesn't seem to a reliable source anywhere. Never thought it would be so so hard to find these. I found a couple of systems on Amazon from a brand called 1byone which happens so have the most reviews of any I've found online.

Below are the three I've narrowed it down to. If yall have any suggestions, I'd appreciate it.

Wired





Wireless 1






Wireless 2











these are some other ones I've found

Wireless 3