Q-See QSDR1744LRC-500 Real-Time Security DVR Advanced H.264 Video Compression CIF Real-Time Recording per Channel (Record & Display at 120/120 FPS) Stream Live Video Directly to a remote PC, iPhone, or other Supported Smartphone Running Windows Mobile Pro or Symbian on 3G Networks. Trigger Email Alerts on Motion Detection Events Conveniently Backup to USB Flash Drive or USB Hard Drive Pre-Installed 500GB Hard Drive; DVR Supports up to 4 Security Cameras