VRx 2500 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 150 IP CAMERAS AND CONFIGURABLE UP TO 288TB RAID 5 or RAID 6 STORAGE) 4U rack mount IP video server includes rail kit. No onboard storage included. Add up to 24 S2-4TB-HDD-G2, 24 S2-8TB-HDD-G2 or 24 S2-12TB-HDD-G2 storage drives with RAID 5 or 6 configurations as required. Minimum of 3 drives required for RAID 5 configuration. Minimum of 4 drives required for RAID 6 configuration. Storage must be configured at time of purchase.