Digital Peripheral QT474-411-5 Q-See 4-Channel Video Surveillance System with 4 Weatherproof Night Vision Cameras and 500 GB Hard Drive The DVR is multiplex so you can simultaneously record, view live or recorded footage, play back footage, back-up files and remotely monitor and manage without any recording loss. Broad administrative control, 2X digital zoom, D1 and CIF recording resolution options, H.264 video compression, easy backup , four weatherproof and 40 foot night vision range Q-See offers its Centralized Management System (CMS) software for its QT-series DVRs Monitor multiple QT-series DVRs from a single computer using just one, simple log-in.