Its a small portable windpower device that charges up a portable battery to use at any given point in time. Downside is the 3D printed parts could degrade overtime outside. Would be nice if there was a commercial (cheap) version of this. I like how it folds up for transport
https://www.instructables.com/WINTURER-a-Portable-NP-F-Battery-Charger-Wind-Turb/