USB on the Go Samsung Galaxy devices can natively support USB flash drives with this adapter, though with other phones/tablets you may need to purchase an App to enable this function (Nexus Media Importer as an example) Not recommended for use with external HDD. Android devices do not support drives with over 32 GB of storage. Copper conductor Length: 7" total, 4" cable only Connector: USB Type B Micro (Male) to USB Type A (Female)