SRS, my three units are WiFi. They're all identical, but one is master and the other two are slaves. Each has an Ethernet port, maybe two (I can't see without disassembling). I have an Ethernet cable from my modem to one unit, and another Ethernet cable from a second unit to my computer. My TV works on WiFi, but I'm considering hardwiring it to my third mesh unit. Are the two "slave" units just repeaters? I dunno, but they work a heck of a lot better than repeaters I've tried in the past. My signal is equally strong throughout the house.