Night Owl Security L-DVR4-5GB 4-Channel 960H DVR with 500GB Hard Drive HDMI and Free Night Owl Lite App (Black) 4 Channel L Series DVR with Pre-installed 500 GB Hard Drive and HDMI Output 960H Recording Resolution (960 x 480) Free Control Management Software and Free "Night Owl Lite" App for Smartphone integration PC and Mac Compatible Motion Activated Recording with Email Alerts