Tooploo Dual SATA USB 2.0 USB 3.0 External Hard Drive Docking Station for 2.5 or 3.5in HDD, SSD USB2.0 standard speed:480Mb/s;Single-letter reader:Only one is allowed to read one card once Dual high speed interface output Support intelligent dormancy function Reading & Writing Speed It can maximally read 2 sets 3TB SATA HDD with USB3.0 standard speed 5Gb/s