GW Security VD4C4CH37HD 4 Channel 960H DVR Surveillance System with 4 x 850TVL Outdoor or Indoor Analog Security Cameras, 500 GB HDD Pre-installed 4 Channel DVR with (4) 850TV Line 3.6mm Wide Angle Lens Security Cameras Support mobile surveillance by phones with Android, Blackberry, WinCE, Symbian, and iPhone Support IE browser to remote view and HDMI & VGA resolution Built in 3.6mm board Lens for wide view angle, 24PCS Infrared LED, up to 80 feet IR distance Pre-installed 500GB Hard Drive with 1 Year Warranty and Free Life Time Tech Support From U.S.A.