16-channel DVR with auto e-mail warning system and FTP image upload capabilities160GB HD for image storage with support for 2 hot-swappable drivesWavelet compression format and motion-triggered recording4 adjustable video quality levels for each channel4 audio inputs with 2 audio and 2 monitor outputsPicture-in-picture viewing option and motion detection functionOn-screen display and real-time clock Power loss memory backup17" W x 4 3/8" H x 13" D