These headphones are for parts or repair. Pretty sure it's a wire loose. Look closely at the pictures. This is exactly what you are getting.
| Brand | Koss |
| Form Factor | Headband |
| Type | Ear-Cup (Over the Ear) |
| Color | Beige |
| Model | PRO/4AA |
| Connectivity | 6.35 mm (1/4 in) |
| Features | Adjustable Headband |
| MPN | PRO/4AA |
| Country Of Origin | United States |
I like the ear-cup style because it blocks street noise and keeps you focused on the music.