The Comprehensive CE-DVISM is a DVI over CAT5 extender over single CAT5 cable up to 70 meters/230ft. The unit is passive, no external power is required. The CE-DVISM is sold as a pair and uses one CAT5/5e/6 cable to send the DVI signal. Extend the transmission distance up to 70 meters at 1024x768. Extend the transmission distance up to 50 meters at 1920x1200. Unit comes with a 2 year warranty.