Features: (1) Unique outward appearance design Industrial grade aluminum drive tray handle device Defer to the customer demand change color of drive tray handle Recognize the Raid position using rubber cap Fiber optical drive tray status indicator (2) Effective cooling system 5x 4cm cooling fans with status monitor (option) (3) Firm main body structure & maximum drive capacity Durable handle may draw out more than 10,000 of times 3.5”hot-swap x 4 (SATA/SAS) , 2.5” HDD x 2, 1 x slim ODD SATA / SAS or Mini SAS backplane for option Front access USB connector x 2 (4) Easy installation and maintenance Support up to ATX ( 12” x 10.5”) Manage Cable in order provide elbowroom assembly Specification: Model NO. U1105M2000 Standard EIA-RS310D Dimension (W x D x H) 481mm x 495mm x 1U (18.9” x19.5” x 1.7”) Material SGCC M/B ATX ( 12” X 10.5”) Drive bays 3.5”hot-swap x 4 (SATA/SAS) , 2.5” HDD x 2, 1 x slim ODD Coolings 5 x 4cm ball bearing (side) Indicators Power, Fan Failure, Lan LED, HDD LED Controls Power on/off, system reset, USB port x 2 Slots 1 (PCI or PCI-E) Power Supply 1U Single PSU (200 x 100 x 40.5mm) (L x W x H)