DIGITAL Multiplexer Recorder 4 Channel Mini Blk Case HD-SDI 25fps DVDRW, 3Tb HDD The VHDR25M-4 is a 4-channel HD-SDI DVR. It can record high definition 1080p footage at 25 frames per second on all 4 channels. It is designed for smaller installations where high definition footage is required. It can also be linked to other VHDR DVRs using CMS software, to form part of a larger installation. It allows for full 1080p high definition footage to be recorded over standard coaxial cable, without the need for new cable on many existing installations.