Zmodo 4CH Security DVR System with 500GB hard drive 4 Outdoor Night Vision Surveillance Cameras -3G Mobile View Video Online with No Service Fees - View your DVR's live or recorded video footage on any PC. Long time recording, 500GB Hard Drive- Base on the H.264 Compression, maximize the hard drives recording time. Network Remote - Access live video footage directly from your mobile phone or PC anytime anywhere Advanced Motion Detection Recording - This allows you record only when motion is detected. 4 Professional Grade Weather Resistant Cameras - See in the Dark with Automatic Night Vision