This is the Open Pill case for the SeedSigner airgapped Bitcoin signing device. This case has been designed by SeedSigner and it provides a simple, safe, secure and hardware less housing for your SeedSigner device. Portions of the profits from the sales of these cases are being donated to the SeedSigner development fund. You could also donate HERE to support the project.
If you would like to learn more about SeedSigner head over to their site. If you are interested in building your own you may want to check their GitHub. You can also check their Explainers section for guides on how to build and use SeedSigner.