One pair can work as a fully functioning module without any setup. Support LPCM or other uncompressed audio formats. Support compressed audio formats including Dolby Digital, DTS Digital, and DTS-HD (including Dolby True HD). HDMI EXTENDER EXTEND SIGNAL BY CAT 5e / 6 USING SINGLE PIECE CAT 5e/ 6 CABLE TO EXTEND HDTV DISPLAY UP TO 60M FOR 1080P.IT NOT ONLY BREAKS THE LIMITATION OF THE HDMI CABLE TRANSMISSION LENGTH, BUT ALSO CAT 6 HAS MORE FLEXIBILITY AND CONVENIENCE IN CABLE CONSTRUCTION. PLUG THE HDMI CONNECTOR OF THE TRANSMITTER INTO THE HDMI SIGNAL SOURCE WITHOUT HDCP , SUCH AS:COMPUTER ,LAPTOP,STB,TV BOX ETC.CONNECT SINGLE CAT 5e /6 CABLE TO BOTH THE OUTPUT OF THE TRANSMITTER AND INPUT OF THE RECEIVER.PLUG THE HDMI CONNECTOR OF THE RECEIVER INTO THE HDMI DISPLAY (SUCH AS: HD-LCD,HD-DLP). THIS HDMI EXTENDER HAS MANY FEATURES THAT ENABLE IT TO PERFORM IN A SUPERIOR MANNER. AMOUNG THOSE FEATURE YOU WILL FIND.ONE PAIR AS A FULL FUNCTIONAL MODULE,NO NEED OF SETTING.CAT 5e/6 CABLE CAN SUBSTITUTE HDMI CABLE TO ACHIEVE LONG DISTANCE TRANSMISSION. FOLLOW THE STANDARD OF IEEE-568B.TRANSMISSION DISTANCE CAN BE UP TO 60Mtrs FOR 1080P USING CAT-6 CABLE.