There’s a brief hard-wired cable terminating in a very USB Type-C plug, and all this from the device no larger than some regular card readers. Just before buying an iPhone SD card reader, it’s important to know which devices are suitable. Here's the iPhone styles that support SD card readers: https://apple-sd-card-reader46543.blogozz.com/26127319/rumored-buzz-on-staples-micro-sd-card-reader