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The Pro Series 4-Channel Tribrid DVR from Dahua Technology supports HDCVI, analog, and IP video inputs for use with a variety of systems. The DVR uses H.264 dual-stream compression technology for fast, high-quality data streaming and supports two SATA HDDs of up to 12TB (1TB included). The RS-485 interface offers PTZ control, and two USB2.0 ports allow you to transfer recordings to external storage. It supports multiple network monitoring via web viewer, CMS (DSS/Smart PSS), and smartphone (DMSS). ONVIF compliance offers compatibility with a wide range of cameras and other devices.