thingiverse
It's a sports case for a 1st gen ipod touch, you can add a wide rubberband on the back to wear it on your arm or the like. I've Included the freecad model if you want to modify it.
Instructions
Just print it on your 3D printer, add a rubberband though the back slots, and you're done!
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, this model is available as a free download on thingiverse. Some creators accept tips or donations.
Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.