You are bidding on a lightly used Grado GW100x wireless Bluetooth headphone.  It comes with its original box, manual, USB-C to USB-A cable, analog 1/8" cable and an extra set of ear cushions.  It includes a 1/8" phone jack line input.  It also has a built-in microphone for taking calls while wearing the headphones.  It uses Bluetooth version 5.2.  The battery takes 2 hours to fully charge and lasts up to 48 hours.  Its frequency response is 20hz - 20khz.