Audio-Technica Wireless Earphones ATH-TWX7 - Brand: Audio-Technica - Model: Wireless Earphones - Color: Black Thank you for viewing. The operation is currently problem-free. I have been using these for about 8 months. Personally, I don't really like noise canceling, so I always used it off. With that, I could use them continuously for about 6-7 hours. Since these are used items, please refrain from purchasing if you are concerned about the feeling of use, stains, etc., or if you are a nervous person.