SONY wireless earbuds. I purchased new earbuds, so I have been carefully storing these at home. ・IPX4 water-resistant design. Enjoy music without worrying about rain or sweat. ・Improved connection stability with integrated processor V1 ・Improved battery performance. 8 hours of battery life on the main unit ・12 hours of case charging, for a total of 24 hours. Supports smartphone-based charging. Significantly enhanced call performance. Advanced audio signal processing with four microphones and sensors. Improved fit to the ear. Ergonomic surface design increases the contact surface compared to previous models, achieving stable fit. Significant improvement in noise cancellation performance. Achieves industry-leading noise cancellation. Significantly improved compared to WF-1000XM3. Wind noise is also significantly reduced. Noise canceling performance improved with integrated processor V1, an evolved 6mm driver, and new ear tips. LDAC compatible. 360RA compatible. Achieves overwhelming high sound quality. Charging time: Approximately 1.5 hours Utilizing data on ear shapes from various countries, the design avoids interference with the contours of the ear. The shape conforms to the ear, and the earbud body is supported by the contact surface inside the ear. Furthermore, the noise isolation ear tips provide holding power in multiple directions, achieving higher wearing stability and a comfortable fit. Used for about 1 year. There are no noticeable scratches or stains, but please refrain from purchasing if you are concerned as this is a used item. Sony Model name: WF-1000XM4 Other features: Noise canceling