That gadget is a breathing exercise device.
It’s said to have 5 adjustable reistances for training your diaphragm and external intercostal muscles.It’s on Amazon under many different names, prices from about $50 to $24. The link below is for the lowest price I could find on 11/1/26 
It’s here on Amazon https://link.amazon/B06ZRBkjZ
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Four people got it, or had answers close enough to be winners.
Mom had something that looked like this for COPD. Was called a breather. Ray from MD.
A lung exerciser – Jason Dorsey
it is a breath exerciser. Steve O.
Breather device that is used to strengthen respiratory/breathing muscles. Bob A.
