The following symptoms come and go. After being submerged in water in a washing machine, a small, high-pitched "beep" noise can be heard from my right ear. This symptom occurs when using both earbuds in either noise-canceling mode or transparency mode. It does not occur in normal mode or when using only one earbud. Also, the noise is masked by other sounds during playback and is not noticeable. They function normally, but the issue may bother some people, so I'm selling them to someone who understands this. Includes a silicone case. Soundcore Liberty 4 wireless earbuds with noise-canceling function. - Brand: soundcore - Model Name: Liberty 4 - Included Accessories: Charging case - App Compatibility: Soundcore app compatible - Features: Noise-canceling function - Color: Black Thank you for looking.