Previous versions
Version Two
This is the second version that shipped to the latest Kickstarter backers in November 2015.
Version One
This is the version that shipped to the Kickstarter backers in November 2014. If yours has pegs holding it together it's most likely this one.
Early Bird Version
This is the version that shipped to the Early Bird Kickstarter backers. It has a simplified PCB and an improved pen arm.
Beta Version
This is the version that shipped to the beta testers from the Kickstarter at the beginning of July.