Sumas 4-Ch Standalone Network DVR Surveillance Kit w/Smartphone Remote Access, USB & VGA - Just Add Hard Drive & Cams! 4-Channel Standalone Network DVR General Features: Black color Digital video/audio recorder Supports one (1) 3.5-inch Serial ATA hard drive up to 2 TB (hard drive not included) H.264 video compression technology Improves video quality for live, recording, and network viewing Graphics Windows OSD interface Two USB interfaces for data backup and mouse operation Password sensitive secure operation