The 40-939B is a high quality 1 x 9 HDTV and analog video distribution amp that can transmit digital or analog audio as well as component and composite video signals to five locations up to 150 ft. the Calrad 40-939B has a loop output giving it the ability to be daisy chained to other units, allowing for longer cable runs and AV distribution to more than 5 displays or to feed a local monitor. If the digital audio port is not used it can be used for standard composite video. Front panel LED power indicator.