VRx 1500 VIDEO MANAGEMENTSYSTEM FAILOVER UNIT Each failover unit can monitor up to 4 other VRx recorders. Failover recorder must be the same model or higher than the units being monitored. No camera licenses required (SUPPORTS UP TO 75 IP CAMERAS AND CONFIGURABLE UP TO 48TB RAID 5 or RAID 6 STORAGE) 1U rack mount IP video server includes rail kit. No onboard storage included. Add up to 4 S2-4TB-HDD-G2, 4 S2-8TB-HDD-G2 or 4 S2-12TB-HDD-G2 storage drives with RAID 5 configuration as required for application. Minimum of 3 drives required for RAID 5 configuration. 4 drives required for RAID 6 configuration. Storage must be configured at time of purchase.