Bose QuietComfort 20 Wired Earphones QC20 - Brand: Bose - Model Name: QuietComfort 20 Used for about six months to a year. There are minor scratches and dirt from use. When noise cancellation is ON, there is a buzzing noise in the right ear. There is no problem when it is OFF. Searching online, it may be necessary to connect it to an amplifier, but I don't have one and haven't been able to test it. Also, it's hard to see, but the part in the third photo seems to be pushed in a little bit... The L-size earphone tips are unused, and the opened earphone tips in use are probably S size. (I don't remember exactly...) I have lightly disinfected them, but since they are used and are inserted into the ears, please refrain from purchasing if you are concerned. There is no box, so I will ship it in the included case + a bag or cardboard box. Please purchase only if you understand the above contents. Thank you.