Eos stereo remote/satellite wireless speaker with built in subwoofer, in Black - for use with EOS-100T1R or EOS-100T1RB. Eos Wireless base system can transmit to up to four Eos wireless speakers. Eos GigaWave technology broadcasts interference-free wireless home audio up to 150 feet indoors and 300 feet outdoors. SRS Wow technology ensures superior sound quality. Maximum number of Eos remote/satellite speakers per Eos base station is 4.