1HD Video balun converts the video signal into a balanced signal, and transmits it on an ordinary Cat-5 unshielded twisted pair cable at a perfect transmission rate. 2Allows your 8 pins Cat5 twisted pair cable display video images at the same time, which can be used in video surveillance and video conferences, and can transmit video signals of four channels. 3Compatible with all HDCVI, HDTVI, HDAHD, supports NTSC, PAL and SECAM video formats; and has a long transmission distance, which can greatly simplify wiring engineering and save wire usage. 4For 720P CVI cameras, the maximum length is about 450m; for 1080P CVI cameras, 720P/1080P TVI cameras and 1080P AHD cameras, the maximum length is about 250m; for 720P AHD cameras, the maximum length is about 320m. 5Excellent anti-interference ability, 60dB anti-interference and anti-noise ability; built-in TVS, can protect up to 4000V surge voltage; no power supply, more convenient to use.