QNAP VS-4012U-PR Pro series NVR is the 4-bay, 1U rackmount model of network surveillance system providing high quality megapixel recording, high performance real-time monitoring. The Linux-based system supports PC-less quick configuration, monitoring of IP cameras over the network, & video playback by connecting a monitor to the built-in VGA connector, a USB (Universal Serial Bus) keyboard, & a USB (Universal Serial Bus) mouse. The NVR supports multi-channel H.264, Mx PEG, MPEG-4, & M-JPEG recording over 800 network camera models from many popular brands. The Vio Stor NVR houses 4 SATA hard drives. It is capable of megapixel recording & multi-server monitoring, a unique feature to allow the users to monitor up to 128 IP cameras from multiple QNAP NVR servers without any extra software. Diversified recording modes such as scheduled recording, alarm recording, alarm recording schedule, motion-detection recording, pre-alarm, & post-alarm recordings are provided.