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AVTECH AVH516 - 16-channel 2-x IP-megapixel video recorder (NVR) with 16 channels of audio from the microphones built into the IP-camera. The DVR allows you to use high-quality IP-video surveillance solutions. NVR is the best product for a simple upgrade your analog video surveillance systems (CCTV) to IP-based systems, while maintaining the old cables. Now existing analog video surveillance system (CCTV) can be used to upgrade to IP-based systems.