USB 3.0 to SATA Hard Drive Docking Station offers swappable access to 2.5" and 3.5" SATA HDD without having to mount the hard drive or installing it in an enclosure. It supports plug and play installation on most operating systems making it a perfect solution to provides a simple fast and cost effective solution for data recovery drive imaging and testing centers or any environment that requires fast access to uninstalled / archived drives. 1. Super speed USB 3.0 (compatible with USB 2.0 / 1.1). 2. Supports two 2.5'' / 3.5'' SATA I / II / III hard drives at the same time. And supports up to 4TB per bay. 3. Top slot-loading design tool free to insert HDD convenient to use. Just simply slide drives gently into top of docking station with SATA connectors aligned. Do not exert force. Drives will attach and rest on the SATA connector with the drive centered in the dock with space for airflow on all sides. 4. Comes with power / data transmission indicator light. 5. The hard drive dock has a 100% tool and screw free design. No more struggling with screws while installing/removing hard drives from external enclosures. 6. Standalone 1:1 Sector by Sector HDD Duplication (no computer needed). Backup or copy your entire hard disk drive contents to suit your needs with the touch of a button and without the need to be connected to any computer.