KGuard All-in-One H.264 Surveillance Combo Kit w/ 8 CMOS 420TVL Cameras 500GB HDD (BR801-8CW154M) H.264 Compression technology Supports D1 Real-time recording and playback Supports simultaneous multi-channel playback with IE browser of videos recorded in different time frames Total online surveillance via IE/Safari browser for remote video & audio live view, playback, setup, backup and filing Pre-recording feature that allows additional images to be captured prior to the motion detected event