USB Flash Drives Feature1. Good quality and super value package deal. 2. No need software to drive and plug in use. 3. original grade A chipset. 4. Light weight, foldable and practical. 5. Every Piece Tested Before Delivery. SpecificationsCapacity4GB Interface Typesupport USB 2.0, backwards with USB1.0 Transfer Speedwriting3M/s-14MB/s; reading10M/s-25MB/s Support PC Modeall brands of PC, Laptop, HP, Dell, Toshiba, etc CompatibilityDesktop, Laptop, Macintosh, Tablet, Speakers and other device with USB ports Operating SystemWindows ME/NT/ 2000/XP/7/8, Linux, Mac OS Working Temperatures-30 C to 70 C Storage Temperature-20 C to 85C Warranty and Service1 years warranty and support replacement and refund service Package Content10 Pack x 4GB USB2.0 Flash Drives NOTEAll product outward appearance, the color take the material object as the picture only supply the reference. And some of the listed capacity on a flash storage device is used for formatting and other functions, thus is not available for data storage. As such, the actual available capacity for data storage is less than what is listed on the products.