Asynchronous Copy, up to 4 Secure Digital (SD), MicroSD/TF cards with adapters (provided) at same time High speed copy up to 35MB/sec per each destination slot Supported Media: Secure Digital, MicroSD (TF cards) flash media with the provided adapter to SD slots Support most file formats, file size, and drive capacity Standalone Duplicator; No computer is Needed Button-less function - Ready to copy when plug in Indication Lights display ongoing copying process (flashing green), error (red), and completed copying process or ready to be copy (solid green)