Swann SW243-4MB DVR4 4-Channel SecuraNet Digital Video Recorder with Installed 250-GB Hard Drive Monitor & record up to 4 cameras simultaneously with expanded features you will love! High compression MPEG4 video format means less storage needed on hard drive and enhanced resolution compared to MJPEG models Triplex operation for simultaneous monitoring, recording & remote viewing Motion detection records activity to pre-installed 250GB hard drive Easy remote viewing 24/7 over the web or local network, with faster streaming than MJPEG models & compatibility with Windows XP & Vista