Using 2.4GHz digital, the WR150 wireless, all-weather rock speakers send quality sound up to 300 feet range unobstructed (may vary depending on the environment). Easy to setup, just plug your music source (iPod, MP3 player, CD-Player) into the wireless transmitter (include RCA and stereo audio input cables) run the speakers where you want them and you"ll be listening to your favorite tunes in the back yard or patio. (Note: Transmitter is wireless; speaker are wired together via speaker cable.)