The Genie GHD102 uses FDM compression modulation technology on the transmitter and allows 2 channels of CVI / AHD / TVI / CVBS camera signals to be compressed and converted into a digital signal which is then transmitted using a single coaxial cable. The receiver then decompresses and re-converts the signal back into 2 separate video channels allowing you to connect to a compatible DVR (CVI / TVI / AHD / CVBS) or video matrix. This product automatically adjusts for transmission distances from 0-200m. The maximum transmission distance supported depends greatly on the quality of the coax cable being used.