koss

Selling a KOSS Open Back GMR-545-AIR Headset. Purchased on 18 August and got delivered on 23 August. Just opened today and tested for maximum 15 minutes. still in replacement period of 2 days of Amazon. I ordered this alongside other headset which is way more costlier than this. And this one...

Up for sale is Koss Porta Pro headphone bought from US a few months ago. They are very less used, like 20 hours usage. No bill and box only leather bag that came along with it. thanks