USB 3.0 OTG (On-the-go) dual-interface USB Flash drive Mobile X31 is now able to meet the requirements and can act as your central data management center by which you can instantly move and store large files such as documents, photos, music and videos between PCs and OTG compatible handheld devices without any cable or needs for Internet. Mobile X31 applies the specialized rotary anti-lost cap design, which can not only perfectly protect the Micro USB connector but also prevent users from worries about cap-loss.