Bestrunner 4G USB to Micro USB Flash Drives U Disk For PC And OTG Smart Phone Specificaiton: Key chain design and fashionable style No need drive， only plug in No Drivers Required. Light weight and foldable，easy to carry Support PC Mode: all brands of PC， Laptop， HP， Dell， Toshiba， etc. SupportWin98\/ME\/2000\/XP\/Vista\/7， Mac OS 9.X Support USB version 2.0 and 1.0 Function1:Ordinary U disk Function2:Micro SD card reader without taking the TF card out of mobile phone Function3:Smart phone external without taking the TF card out of mobile phone Capacity:4GB Size: 69*19*10mm(fold) Color: white，black，light red，yellow，gray，blue，green，purple，red for your choice Package Included: 1 x USB Flash Drive(colors for your choice)