This is the popular Sennheiser HD 4.50BTNC model. It supports Bluetooth connection and noise cancellation. With a battery that lasts over 24 hours, it's convenient for commuting, going to school, and traveling. Operation has been confirmed, and it works without any problems. The battery is still in good condition. There are some minor scratches from use, so please check the photos. Included items: Main unit only, original charger. Please refrain from purchasing if you are sensitive to used items. Thank you!