Apple’s USB-C to USB Adapter is a “dongle-style” adapter that allows older USB-A devices to be converted to USB-C or Thunderbolt 3. Apple described the adapter:
“The USB-C to USB Adapter lets you connect iOS devices and many of your standard USB accessories to a USB-C or Thunderbolt 3 (USB-C) enabled Mac, iPad, or iPhone. Plug the USB-C end of the adapter into a USB-C or Thunderbolt 3 (USB-C) port on your Mac, iPad, or iPhone, and then connect your flash drive, camera, or other standard USB device. You can also connect a Lightning to USB cable to sync and charge your iPhone, iPad, or iPod.”
According to Apple, it “supports data-transfer speeds up to 5Gbps (USB 3.1 Gen 1).” Further, you may “Use the USB-A port of this adapter with flash drives, cameras, USB hubs, and other devices that connect to USB-A for data transfer or charging.”
Source: Apple (product, support)
