... high compression, support dual stream network transmission Wholesale 4 Channel CCTV Security Standalong DVR , 4CH Standalone DVR , 12VDC DVR , ... backup & remote accessControl ModeFront panel, USB mouse, IR remote control, Keyboard, NetworkVideoInput4channel, BNC (1.0Vp-p/75Ω)StandardPAL system (25 frames ... SATA port, Max 2TB HDD supported Wholesale 4 Channel CCTV Security Standalong DVR (JD-DVR7504)