EltonNoway wrote:It's not so much the number of outlets that you have... as much as having the two outlets you intend to use on the same house power circuit.
In other words... if you plug one unit at your router or computer room... and the other unit in your garage or home office, and the two locations are on a "different" circuit breakers,... these may not work. Read the reviews on Amazon.
It's not so much that it's a different breaker, it's that house wiring has two 120v "legs". Inside the breaker box, every other breaker is on opposite legs. These devices need to be plugged into the same leg, or you need to have a special bridging device, usually installed at the breaker box, that allows the signals to travel from one leg to the other. X10 suffers the same inconvenience. Interestingly, the signals get bridged automatically whenever a 220v device is operating. So, if you don't mind leaving your oven or dryer on, you can avoid installing a bridge.
As for the signals not leaving the house, not being able to get past the main breaker, as an Electrical Engineer I cannot see why they wouldn't very easily travel through that breaker. Unless the breaker is manufactured with a low-pass filter inline, it is essentially just a piece of wire. AC, DC, whatever will pass quite well in both directions.