4CH DVR VGA-out, 1 SATA HDD bay, H264 Security Surveillance DVR Digital Video Recorder System, Support Network Remote Viewing Over Internet, Windows IE, iPhone, iPad, iPod Touch, Android, BlackBerry, Nokia, Windows Mobile, and Apple Mac Safari, FireFox. EagleEyes Software, Windows and Mac Central Management Software software are included with FREE 500G Hard Drive VGA output for LCD monitors, Remote control, USB backup H264/MPEG4 DVR Technolog, Longer Recording Hours Support TCP/IP, PPPoE, DHCP & DDNS Network Connection Video Input 4 Channels. Composite video signal 1 Vp-p 75 BNC 1 channel Audio Input and output, Ready for SATA hard disk