Features: 1.4 Bay Expansion: The 4 Bay HDD cage is installed in a standard chassis 5.25in drive tray and supports four 2.5in hard drives at the same time 2.Scope of Application: The SSD mobile rack is compatible with 9.5mm and 12.5mm thick hard drives and SSDs, suitable for IT professionals 3.Quiet Fan: The HDD mobile rack has a built in long lasting silent fan, which greatly increases the efficiency and service life of the hard disk 4.Indicator Light: The 4 Bay 2.5in HDD cage has LED hard disk power on and data signal indicators to keep abreast of hard disk operation status 5.Protection Function: The 4 Bay SSD cage built in circuit security technology, 9 kinds of composite safety data circuit protection design, multiple protections such as overcurrent, overvoltage, leakage, etc 6.Plug and Play: The HDD mobile rack has a humanized hard disk tray structure design, which can be installed and removed with one push and one pull, plug and play specification:Item Type: 4 Bay HDD Cage Material: Aluminum Alloy, Engineering Plastic Supported Capacity: 3TB Transmission Interface: SATA Transmission Speed: 6Gbps Support Hard Disk: 2.5in SATA , SATA , SATA , HDD,Hard Disk, SSD Transmission Rate: SATA : (1.5Gbps), SATA : (3.0Gbps), SATA : (6.0Gbps) Support System: For Win, for Win XP, for Win Vista, for Win7, for Win8.x, for Win10, for OS10x, for Linux Indicator Light: Green: HDD Status Red: Hard Drive Storage PackageList: 1 x4 Bay HDD Cage 4 x SATA Cables 16 x Hard Drive Screws 6 x Hard Drive Cage Screws 1 x User Manual