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 4 x8cm hot-swappable system cooling fans with status monitor 1 x 9cm ball bearing fan on rear to optimize airflow   (3) Firm main body structure & maximum drive capacity Durable handle may draw out more than 10,000 of times 3.5”hot-swp x 24, internal 3.5”x 4, , slim DVD x 1 single / multilane SATA / SAS backplane option   (4) Easy installation and maintenance Support up to EATX ( 12” x 13”) Manage Cable in order Extractable fan module bracket provide elbowroom assembly Options for 14 / 20 slot rear plate   Specification: Model NO.      U4025H3000 Standard EIA-RS310D Dimension (W x D x H)   481mm x 660mm x4U (17.4” x26” x 4U) Material  SGCC / 1.2mm thickness Backplane       SATA 3G, SAS, SATA Multilane M/B Extended ATX ( 12” X 13”) / Quad CPU ATX Board Drive bays       3.5”hot-swap x 24, internal 3.5”x 4, slim DVD x 1 Coolings  4 x 8cm hot-swappable cooling fans (middle) + 1 x 9cm cooling fan (rear) Controls  Power on/off, system reset, Power Supply 1350W (Zippy Model : M1W4-6D50F)