This add-on board adds 2 new buttons (likely mapped as L2 and R2). This add-on board’s only feature is to add L2/R2 “trigger/shoulder” buttons to your Freeplay CM3 in the Boxy Pixel shell “inside” of the normal L/R shoulder buttons. This kit will require adding parts to your existing Freeplay CM3 which will involve soldering and modifications to the plastic shoulder buttons. It will also require you to install and edit software on your Freeplay CM3. It is intended for builders that have experience soldering and are okay with logging into Linux and making changes there.
This will come with button caps (as shown). A couple typical usage examples are also shown. The low profile example was made by cutting the button caps about in half before pressing them onto the button shaft.