To make things fit he ended up cutting a good portion of a USB hub’s circuit board off and placing it beneath the mouse circuitry. You can see the board from the thumb drive wedged into one end ...
While it might look like a disrobed flash drive or RTL-SDR dongle, the USB Armory Mk II is actually a full-fledged open hardware computer built into the ubiquitous USB “stick” format.
Plug one end of the Zefiro dongle into the USB-C port of your phone ... accessible [music-making] to everyone." The Zefiro's thumb drive dimensions and reasonable price point adhere to that ...
That same year, Singaporean company Trek 2000 International also began selling its 8 MB "ThumbDrive." Today you can purchase USB flash drives with hundreds of gigabytes of storage on the cheap.