Thank you for viewing. This is the KOSS Porta Pro Wireless. I purchased it about two years ago and I think I've used it about twice. It's difficult to tell from the pictures, but the main body can be folded up to the size of your palm. I loved this kind of gimmick. I was hoping to watch movies with a projector using the KOSS headphones, but I haven't had the time to watch movies at all, so I'd like to pass it on to someone who can fulfill my wish. Product description, quoted below. 15-25,000 Hz 60 ohms 101 dB SPL Wireless Bluetooth 5.2 Battery life of over 20 hours Built-in microphone and audio control USB-C charging and analog audio pass-through Includes: Porta Pro Wireless, Hard shell case, USB-C to USB-A charging cord, USB-C to 3.5mm analog audio pass-through cord.