Unfortunately, with my $400 router, plus wifi range extenders, plus Ring range extenders, I can barley get a connection 100 feet away from my router to my secondary detached garage. I tried using ring extenders first and that did nothing. I had to buy a few wifi range extenders on Amazon for about $20 each, and even then the connection is poor-good at best. That's about 100ft so idk about 400, maybe your WiFi is better though, who knows.