The Gefen EXT-AUD-144 is a 1x4 Audio Distribution Amplifier allows you to send one analog audio signal to up to four separate locations using the same audio source. As an added bonus, it also has the capability to extend each distributed audio signal up to 1000 feet away from your computer. The 1x4 Audio Distribution Amplifier sender unit connects to your audio source using stereo cables supplied by Gefen. One small receiver unit per audio channel connects to each of the speakers or audio output devices (up to four at a time). One CAT-5 cable per audio channel connects the sender to the multiple receivers at the distributed locations - up to 1000 feet away.