People ask me this all the time. My answer is, There are no such thing as wireless speakers. Any current wireless system sends signal via RF, which means and "wireless" speaker has to have an RF receiver to get the signal, and an amplifier to drive the speaker it self. This means the amp, and RF receiver need a power source to do that. Either battery, or plug in. Its probably easier to run actual speaker wires, than power to everywhere you would want speakers. The only acceptions I know are the
Klipsch Light speakers, which replaces a typical can light bulb, and uses the power from the light, to receive and power each speaker. Either that, or Sonos, which is basically an amp with a wifi receiver to drive speakers in a room.
So Battery powered, or wall plug in, or traditional speakers, some way or another, your going to need some wires!