Grandstream Networks GVR3550 Business Network Video Recorder, RAID 0/1 Support Up to 24 channels of 720p HD or 12 channels of 1080p HD audio/video real-time recording Automatic discovery for IP cameras on the local network Fully customizable recording rules: time based, event based, manual or automatic Up to 4 SATA 3.5 internal hard drives with maximum 16TB storage and RAID 0 or RAID 1 configurations Complete security features including role based access control, event/system logs and hard drive content encryption