A digital video recorder (DVR) is a device that records video in a digital format to a disk drive or other memory medium within a device
4CH VIDEO 4 Ch Audio Stand Alone DVR, H.264 Compression, D1 in Preview, 4CH D1CIF, 1Ch D1 or 4Ch CIF Play back same time, 2HDD up to 2TB(4TB), DDNS, CMS Software + Mobile Viewing Support, VGA, Monitor.