Capacity:A. 256MB*20PCS KEXIN USB Flash Drive Feature: 1. Credit card design. Easy to carry in Wallet. Flat surface for LOGO stickers or markers. 2. Measurement: 3.38" x 2.12" x 0.07 " ( 8.6 x 5.4 x 0.2 cm ). It comes with Lanyard hole. 3. Color Options: White Tech Specifications: Chip: Grade A, original brand Interface Type: USB 2.0. USB 2.0 Compatible Compatibility: Desktop, Laptop, Macintosh, Tablet, Speakers all with USB port Operating System : Windows 7/Vista/XP/2000/ME/NT,Linux and Mac OS Package Includes: 20 x Flash Drives Tips: Some of the listed capacity on a Flash storage device is used for formatting and other functions and 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. Please use the credit card flash drive with the aid of a USB hub if you have a tight space to insert it into your laptop. Service: Thank you for choosing KEXIN products. If you are not happy with KEXIN products, please do not hesitate to contact us. In every customer relationship, KEXIN strives to be a trusted partner and seeks to achieve 100% customer satisfaction.