Litop 5PCS Black Color Metal Swivel Style USB Flash Drive Digital Data Traveler USB 2.0 for Officeman and Students Office Use School Use Lab Use (16GB, 5PCS Black) Fashionable Style and Key Chain Design; made of stainless steel; Package includes 5pcs USB drives Small and pocket-sized for easy transportability Easy to use, just plug in and play directly, no need any extra power supply Operating system: supported windows 7 /8,Vista/XP/2000/ME/98/910, Mac OS 8.6 above and Linux, etc. High speed in writing /reading transfer