"Wireless" speakers are in the news everywhere today, but what's the catch? Well, the hidden truth is that they are not wireless. Those popular PLAY speakers? They plug into the wall. Wireless rear speakers? Same thing.
When you buy a "wireless" speaker, all you are really doing is replacing speaker wire (which is low voltage) with a full voltage electric wire.
In fact, the same is true of most other audio categories. Those "wireless" cable boxes that supposedly let you remove the wires from your life? They have a power cord. Chromecast, Fire Stick and all other "wireless" dongles - they all need power and they all use wires.
So why can they advertise as wireless? We don't know. But we do know that it's easy and safe to run speaker wire, and it also sounds the best.