Check the listing for details. 20 Pack 4GB Flash Memory Stick USB 2.0 Flash Drive High Speed Thumb Pen Storage. Color: Any color, Condition: New, Made in China. Listed at 51.30 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. Compatible with Windows 7/Windows 8, Windows XP, Windows , 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 USB port The data read speed: 8M-18M/S（USB2.0） The data write speed: 3M-7M/S（USB2.0) Operatin.