http://uk.transcend-info.com/products/Catlist.asp?modno=501&cat_no=229 Features: - Refined zinc alloy body - COB (Chip on Board) manufacturing technique - Excellent for USB OTG (On-The-Go) - Easy Plug and Play installation - USB powered. No external power or battery needed - Offers a free download of Transcend Elite data management tools - Limited Lifetime Warranty Specifications: Size 28.1mm x 12.25mm x 4.5mm Weight 3.2g Interface USB 2.0 (Standard A / Micro B) Certificates CE, FCC, BSMI *Note Both USB connectors cannot be used at the same time. System Requirements: Desktop or notebook computer with a USB port and one of the following operating systems: - Microsoft Windows XP - Microsoft Windows Vista - Microsoft Windows 7 - Microsoft Windows 8 - Microsoft Windows 8.1 - MAC OS 9.0 or later - Linux Kernel 2.4.2 or later Tablet or mobile phone with a micro B USB connector and support for USB OTG host function