Q-See QSDR04RTC-320 4 Channel H.264 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 Conveniently Backup to USB Flash Drive or USB Hard Drive Pre-Installed 320GB Hard Drive; DVR Supports up to 4 Security Cameras