Does not work with AFCI or GFCI
CAUTION: I have read several reviews that say this product may not work if your wiring is too old. Here's the kick in the nuts: It definitely won't work if your house wiring to too NEW!!
New houses and renovations are going to comply with NEC 2104 or later (if done legally). Since the 2014 edition, the Code requires AFCI breakers for virtually all indoor circuits. Exceptions still require a GFCI circuit. This product does not work with AFCI or GFCI. (There are some reports that it might work with AFCI breakers that are not the Siemens brand, but that is exactly what I have.) If you have a non-Siemens combination AFCI/GFCI breaker or an AFCI breaker with a GFCI receptacle, you're still screwed.
Finally, in my case I need the transmitter and the receiver in different parts of the house where the respective circuits are on two different panels. Again, screwed, even when I swapped to regular old-school breakers. Circuits need to be on the same panel.
It does works if the transmitter and receiver are on the same circuit, even if that circuit is AFCI. But the idea is to extend your WiFi reach to a different part of the house. Any house that needs to have a WiFi extender is going to be too large to have only one circuit for all receptacles.
Verified purchase: YesCondition: Pre-owned