Capacity:4GB | Color:50pack-Black KOOTION USB Flash Drives Feature: 1. Good quality and super value package deal. 2. No need software to drive and plug in use. 3. High quality original grade A chipset. 4. Light weight, foldable and practical. 5. Every Piece Tested Before Delivery. Specifications: Capacity: 2GB Interface Type: support USB 2.0, backwards with USB1.0 Transfer Speed: writing: 2.5M/s-10MB/s; reading: 10M/s-22MB/s Support PC Mode: all brands of PC, Laptop, HP, Dell, Toshiba, etc Compatibility: Desktop, Laptop, Macintosh, Tablet, Speakers and other device with USB ports Operating System: Windows ME/NT/ 2000/XP/7/8, Linux, Mac OS Working Temperatures: -30º C to 70º C Storage Temperature: -20 º C to 85ºC Warranty and Service: 1 years warranty and support replacement and refund service Package Content: 50 Pack x 2GB USB2.0 Flash Drives NOTE: All 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.