The SanDisk Ultra Fit USB 3.2 Gen 1 Flash Drive has an ultra-compact design so you can plug and forget, making it easy to add extra storage. Spend less time waiting and more time doing with fast transfer speeds up to 400MB/s. This fast flash drive adds up to 256GB of storage for your content.(Based on read speed. 1 MB/s = 1 million bytes per second. Based on internal testing; performance may vary depending upon host device, usage conditions, drive capacity, and other factors. USB 3.0 port required. 1GB=1,000,000,000 bytes. Actual user storage less.)