US421ZS Ultra High Resolutions 4 Channel H.264 Security DVR 120FPS D1/960H RealTime True Triplex audio & Video recording, Remote viewing & control, I-phone & Android App 1080P HDMI/VGA Output, NO Hard Drive U.S. Security Solutions DVR manufactured for the U.S. market in Taiwan. Incredibly stable user friendly graphical user interface (GUI) with advanced H.264. Full U.S.A Warranty and life time U.S. support make this 960H DVR the number one choice for professionals 4 Channel 120FPS Video/Audio Recorder, Industrial Grade Embedded Linux DVR Full 960H/D1 30FPS on each of the Channels Ultra High recording and playback with True hardware H.264 Compression with 5X zoom in live and playback Variable resolution CIF/ half D1/ D1/ 960H, image quality, image rate, several recording modes, including schedule, motion, alarm and panic button recording, each with individually adjustable settings per channel HDMI out at Full HD 1080P, VGA out at Full HD 1080P, BNC Spot and BNC Main output for total of Four displays. 4 audio channels allow you to listen, record and playback audio with video over the internet. Dual processer and large memory allows for dual stream for 100% independent Remote view accounts and live operation with 120 FPS H.264 network server. Backup options available through Network or USB 2.0 Port