"Wired headphones" refers to headphones that connect to a device, like a phone or computer, using a physical wire or cable instead of using wireless technology. Full definition
Listening to music with Bluetooth headphones connected to your phone is convenient, but wireless headphones can never compete with a great set of wired headphones for sound quality, right? (digitaltrends.com)
That also means you can't charge your phone and listen with wired headphones at the same time. (androidauthority.com)
You also get a 3.5 mm headphone jack at the top of the phone for using wired headphones without an adapter. (techradar.com)