Since it works only on one circuit it's really great if you need an intercom from one side of a room to the other, except it'll feed back if you try to use it. Otherwise there is no mention that it works only on one circuit so you'll end up spending an hour or two trying to figure out why it works when you test it, but why it won't work when you finally put it where you want it. If you didn't understand like I did that some home smart systems run transmit along wiring you'd never figure it out and it still took me awhile to figure it out.That bullpucky about 1500 feet? Who has a house with a 1500 ft circuit? What one room a fifth of a mile long?I long for a company that is smart enough to do the research themselves. I DON'T want 500 choices where 497 are crap. I want THREE choices. I want the best only cheap, medium, expensive. Retailers should do something to earn their money like do some testing on what you sell.