Avtech AVC798 16 Channel H.264 network CCTV DVR (digital video recorder). H.264 video compression technology Highly improves video quality for live, recording, and network; Recording file size is minimized for longest recording time; Lower bit rate required for fastest network transfer. This Avtech surveillance DVR features Long Recording Time: The recording time is greatly extended with the smart recording design that only the motion-triggered channel will be recorded, and the video loss channel won't be recorded. VGA Output: Built-in VGA interface; Output resolution up to 1600 x 1200. Multiplex Operation: Allows users to operate live display / playback, recording, backup, and network simultaneously. Audio Recording: Supports four audio inputs and two audio outputs. Quick Search: Supports time search, event (motion-triggered recording) search and alarm search. Easy Backup: Supports USB flash drive, DVD writer (optional), and network for easy backup. Easy Playback on PC: All the backup files can be played directly on your computer by Windows Media Player.