USB Flash Drive 64GB OTG for Tablets and Smartphones with Micro USB Plug the A-USB Key St to an Android Smartphone or tablet, read, copy, view files from the A-USB Key ST using "My Files" app. Play video files directly form the A-USB Key ST A-USB Key ST integrates memory branded Samsung, which means quality and security. A-USB Key ST provides an extension memory function, like an external hard drive.