COWIN Noise Canceling Bluetooth Headphones

Protein Ear Pads? Does that mean leather?

Not leather. But I did learn something new via Google.

“Protein Leather is synthetic leather made with a special type of resin as well as egg shell protein.”

https://www.quora.com/What-is-protein-leather-protein-leatherette

I got it on friday last week, but the left side of the headphone makes sound when I put it in NC mode, I don’t know if it’s an issue only in my headphone or it’s a common issue.