How does a wireless room-to-room home intercom work?

Question

How does a wireless room-to-room home intercom work?

Answer 1

Most use either the 2.4 or 5 gigahertz bands just like cordless phones. A few use a zigby mesh system which is more like cel phone systems. The mesh would be most reliable but the RF works fine in almost every case.

If you can hard wire, that's the absolute most reliable!