Twingo by NTW - Twin USB On-the-Go Swappable Micro SD Card Reader, USB and Micro USB - NUST2-AMC-MMCBK On-the-go USB swappable micro SD Reader for ease of storage and transfer of data. Features a micro USB on one end and standard 2.0 USB allowing you mobile device to become a host device. For a list of compatible mobile devices, visit www.ntwgroup.net. Micro SD card capacity tested up to 64GB. Easy eject button to access and change micro SD card.