Check the listing for details. 5PCS 10PCS 4GB USB 2.0 Flash Drive Thumb Storage U Disk Metal Key Memory Sticks. Color: Mixed colors, Condition: New. Listed at 13.99 USD. Features: 100% New&High Quality Storage Capacity: 4GB Support USB version 2.0 and 1.0 Easy plug and play installation Interface: USB 2.0; Capacity: 4GB Due to the inner system and procedure data will occupy some space and the real capacity will reduce lightly Stylish lightweight; portable,new concept modeling,classic fashion,compact Brisk High Speed; plug and play, in line with USB 2.0 specification, data transfer speed. The data read speed: 8M-18M/S（USB2.0） The data write speed: 3M-7M/S（USB2.0) Compatible with Windows 7/Windows 8/Windows 10, Windows XP, Windows Vista, Hi-Speed USB 2.0 port required for high speed transfer Support solution for Linux kernel version 2.4 or later version Driveless for OS 9X or up Durable solid-state storage No external power is required 4.5V ~ 5.5V from US.