Koss PRO3AA Titanium Collapsible Over-Ear Stereo Headphones with 6.3mm Adapter, Open Box - Walmart.com
Amazon.com: Koss BT539iK Wireless Bluetooth Over-Ear Headphones,On-Board Microphone and Touch Controls, Detachable Cord Included, Dark Grey and Black : Electronics
Porta Pro® Wireless Bluetooth® Headphones - Koss Stereophones