Sonoff ZigBee switch with No Neutral Wire ZBMINI-L

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FYI. For those in North America:

Sizes of In-wall Relays (FYI)

FYI. I was recently contracted by a client who wanted smart control of his switches, but wanted his existing switches to remain. The solution, is to use "in wall relays". However, given, that the house is relatively older, the internal junction boxes ("gangs"), are relatively small. Here I present the actual sizes of the three smallest dual channel devices that I could find. (Note: There are significant differences between these, but if size is your key parameter, this should help you decide.…