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FlexCage MB973SP-2B is a 3-in-2 tray-less SATA 6 Gbps HDD cage for 3.5" SATA hard drives. The FlexCage brings enthusiast preferred features such as: Plug and Play tray-less design, replaceable 80 mm cooling fan, 3 speed fan control with Smart Cooling technology, integrated USB 3.0 hub, and full control of your drive with individual childproof power buttons. It is designed to be used in consumer and enthusiast systems such as, gaming / media computer cases, and home servers that hot swap frequently.