Ubiquiti Networks - AIRVISION-C - AirVision NVR Controller 500GB 50 Camera
The airVision NVR is a plug-and-play NVR appliance with low power consumption.  The airVision software is pre-installed for quick and easy installation.  No additional software required.  Plug it into the network, go through the configuration wizard, and it is set up and ready to go!