... 4.X MacOS.5Transfer RateUSB 2.0 High Speed .6Read speed15MB/S, Write Speed: 12MB/ S.7CompatibilityPC and Mac,8Data ... carry,No pollution to Environment Antimagnetic, antiknock, moisture resistance, high temperature resistance, Hit resistance . Operating Temperature 32F to 140F ... firmware upgrade, electromagnetic interference and so on USB flash drive, usb flash disk ,usb pen drive, usb memory drive,usb 2 ...