4ch 120fps H.264 Pentaplex TM-Series Standalone: 500GB HDD, VGA, Network, USB 2.0, Mouse, 2-way Audio H.264 compression to make best use of maximum hard drive storage Pentaplex operation: Live display, record, backup, playback, and network access simultaneously Intuitive interface for easy configuration and menu driven operation Backup: USB devices, network 500gb hard drive