4U 24 bay 6Gb SAS to SAS/SATA II RAID sub-system, single controller, 1GB Cache memory, dual miniSAS host interface, two SAS expansion port, twenty four hot swappable disk canisters, hot swappable load sharing 460 watts x 3 redundant power supplies, one External Mini SAS SFF-8088 to Mini SAS SFF-8088 Cable, L=180cm , one RS232 cable, three Power cords, Rackmount kit, CD of owner's manual, one spare FAN and disk canister.