GeoVision offers a range of HD-SDI DVRs. These DVRs record high resolution footage from HD-SDI security cameras. The footage is transmitted over coaxial cable from the security cameras to the DVR. Users can monitor the footage live or store it on the DVR for viewing later. These recorders are the ideal choice for users looking to upgrade their standard definition Analog system to a high definition system. Browse GeoVision's selection to find the best DVR for your surveillance needs.