Stellar Boost XT Ruggedized 32GB USB 3.0/USB OTG Storage for Android Tablets and Phones -Up To 140MB/s Transfer Speeds USB 3.0/Connector for PC/Mac Micro USB connector for Android 4.0 & up - based smartphones/tablets 16GB: Up to 110MB/s Read, 10MB/s Write 32GB and 64GB: Up to 110MB/s Read, 20MB/s Write Driverless support for most operating system Compatible with Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000, Windows ME, Linux 2.4 and later, Mac OS9, X and later Rubber ruggedized housing for protection (8 grams)