Used Anker Soundcore Liberty Air 4. This is not the NC or Pro model. 〇 Operation Pairing, wired/wireless charging, earphone charging, sound output from both earphones, noise cancellation, ambient sound mode, touch operation, wearing detection, case button, and indicator light all work without any problems. 〇 Appearance There are no scratches or distortions, but there are some scuffs on the case due to normal use. 〇 Battery Both the case and the earphones have experienced a decrease in battery life, estimated to be about 80% of the original capacity. With LDAC, noise cancellation on, and at a moderate volume, the right earphone can play continuously for 1 hour and 50 minutes, and the left earphone for about 2 hours. The product will be cleaned with a disinfectant wipe, unpaired, and initialized before shipping. If you have any questions or anything you would like to ask, please feel free to comment. Thank you for viewing.