Hornettek  OT-201U2S Lycan 2.5-Inch USB 2.0 External Enclosure with One Touch Backup Software One-touch-backup button for automatic backup support Universal fitting for 2.5" SATAHDD Backup4all software support for OTB function Hot swappable, plug and play Rigid aluminum housing for heat-dissipation Bus powered under Low capacity HDD. No power adapter required under low power consumption Patented backup button