Coolmax HD-250TN-U3 external enclosure with aluminum hairline finished & SuperSpeed USB 3.0 Connection. It has latest USB 3.0 technology which is 10 times faster than USB 2.0 & no power adapter required. Quickly store and backup your data. Aluminum casing has well protected the hard drive and good heat dissipation. This is a perfect 2.5" enclosure for you to carry out.