QNAP VS-12148U-RP Pro Network video Recorder with 48-channel, 12-bay, Redundant Power, VGA Local Display Real-time monitoring and recording (video/audio) from maximum 48 IP cameras, High quality H.264, MPEG-4, M-JPEG, and MxPEG recording Complete recording features, megapixel recording, PC-less network surveillance by HD VGA local display Multi-server monitoring (up to 128 channels), Dual display mode, Dynamic E-map Linux-embedded, highly reliable standalone NVR, advanced RAID with hot-swappable hard drives design, Online RAID capacity expansion and online RAID level migration