New 4 Channel Embedded Linux US411ZS D1 H.264 Network DVR No Hard Drive, Real time True Triplex with built web server for remote viewing and operation, backup and operation 4CH DVR 480FPS SATA ready H.264 Main Profile Compression Technology, which save 20% or more recording size than traditional H.264 Baseline Profile codec. 2 USB allows to operate DVR by mouse or touch panel screen. Triplex for Recording, Playback and Network 4CH Real-Time display on 480fps/NTSC Supports D1 / HD1 / CIF Resolutions. Triple Stream, recording at D1 and viewing at CIF remotely Supports 100% Independent Network. Watermark & Scrambling examination to verify recorded files.