Camvtech Usa "Ambassador Hybrid" 8-channel AHD CCTV Surveillance Video Security System, Supports: 8ch x 960H Or 8ch x 720P Or " IP" 8ch x720H NVR w/high end Performance, This DVR Has Been Equipped with Completely New Features. Innovative Qr-code Scan Connectivity Allows You to Quickly and Easily Connect to Your Smartphone, Tablet, Motion Detect. Preset system from our IT team. Call us for help if need it. ITGVC.com 1. AHD Analog High Definition , Supports 5 mix modes AHD xTVI x CVI x IP . 2. Hard Disk Storage Support 1SATA 4TB HDD: 1TB Included 3. In order to see the maximum effective pixels for Cameras (700 TV-Lines and up), you would need to use a 960H DVR such as this. 4. Support pre-alarm recording (before 10 sec),not lose any suspicious screen. 5. Support all kinds of mobile monitor (iPhone, Windows Mobile, BlackBerry, Symbian, Android)