3 Supported: Basic USB Accessories
Many basic USB accessories were supported by previous iPad Pro models, but always required peripheral accessories to connect them. The new iPad Pro devices with USB-C changes that and streamlines the process.
You can now connect a variety of plug-and-play speakers, MIDI keyboards or microphones to your iPad Pro via USB-C or a dongle (though some accessories will require a USB bus with a higher power draw). Interestingly, if you use a USB-C Ethernet adapter, you can also get hardwired gigabit internet on your tablet.