Great question — answering as the UphillTech team:
There is no magic wireless system. Traditional switches - regular, 3-way and 4-way - are all based on physically connecting/disconnecting wires. Incredibly simple and reliable, switches very inexpensive, but with the catch that two or three or sometimes even four wires (not counting ground) are needed to connect each switch properly. Some smart switches (electronic timers, wireless remotes, WiFi control, etc. - lots of varieties) when used in multiple switch circuits (a.k.a., 3-way and 4-way) require using matching devices in every switch location and then also allow a remote. Some smart switches only require one switch to be replaced and use either the existing wiring with ordinary...
Full answer by manassehkatz-Moving 2 Codidact: https://diy.stackexchange.com/a/310405 (CC BY-SA 4.0).
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