The motion detection feature allows you to record pictures only when movement is detected, thus allowing you save hard disk space and increase the time it lasts.

4 Channel M-JPEG Compression Algorithm, 4 Channel Video Input, 1Channel BNC output  and 1 VGA, Trine real time Operating System. 25 Frames per Second per channel, Real time playbackat CIF Resolution, Motion Detection, Sensor, Triggered & Time Schedule recording mode, Motion Detection Area & Sensitivity adjustment for individual camera, PTZ Control RS485 Port, With auto switch display function, Backup via USB 2.0 Cable to computer, With power recovery auto-record function, One fixed HDD rack that supports up to 500GB SATA , IR Remote included.