EOS 100RB Additional Black Wireless Remote Speaker for use with EOS base System Additional wireless speaker for use with Eos base system Two neodymium tweeters & a ported back-firing subwoofer for rich, full sound 2.1 surround sound stereo with independent volume control Rugged enough for outdoor use; range of 150-feet indoors, 300-feet outdoors Wall outlet mounting or tabletop stand