HD-SDI High Definition 4 Channel Plug & Play DVR, 1080P realtime preview, 4CH 1080P realtime playback, support E-SATA, support LOOP. 4 alarm in/1 out. iPhone, Android Viewing. HDMI & VGA. Utilize graphic user interface 1080P realtime preview, 4CH 1080P realtime playback Support E-SATA Support LOOP 4ch sensor input, 1 channel alarm out Support VGA &HDMI Output Utilize graphic user interface Support full mouse control Support IE browser to remote view Support mobile surveillance by phones with Andriod, WinCE, Symbian, Windows, MAC and iPhone Support multi-level user management. Administrator can manage the operating rights of other users Support USB2.0 Backup User & Log Management Only connect to HD-SDI Cameras