Usb 20 stick memory size 4 gb read speed 28 mbs write speed 65 mbs backward compatible with usb 11 memory type flash memory material aluminum series intenso alu line manufacturers warranty 2 years weight 6 g additional information read and write speed may vary depending on the capacity compatible operating systems windows xp windows vista windows 7 windows 8 mac os x 106 linux 24 fastener with cap colour black