These open-ear headphones offer high-quality sound with Hi-Res and LDAC support. They provide up to 52 hours of playback, wireless charging, multi-point connection, a dedicated app, and IPX5 water resistance. ◯ Condition Used for less than 1 hour, with almost no scratches or signs of use. Operation has been confirmed and there are no issues. They will be carefully packaged after water and shock protection measures are taken. ◯ Accessories All included. Outer and inner boxes, main unit, charging cable, instruction manual ◯ Product Information (extracted from the manufacturer) 【A New Experience of Ultra-High Definition & Deep Bass】 Equipped with a 17x12mm triple magnet driver to reproduce powerful bass. Hi-Res and LDAC support faithfully reproduces even the finest sound details. Built-in three algorithms: bass enhancement, dynamic audio, and automatic volume adjustment. Delivers powerful bass across all frequencies and automatically optimizes volume and tuning by sensing ambient noise. Sound that caters to you in any environment. 【A New Experience of Comfortable Open-Ear Design】 The joint between the acoustic chamber and the ear hook is designed based on an analysis of numerous ear shape data by specialized engineers, resulting in an optimal "35.6-degree offset angle." It fits naturally without putting pressure on the auricle, and the large-diameter driver brings high-quality sound with a sense of realism by being closer to the ear canal. The ear hook uses skin-friendly liquid silicone, and a shape-memory titanium wire is built inside. The multi-faceted arch structure applied to the front and back evenly distributes pressure across the entire ear, maintaining comfort even during long hours of use. 【Fast Charging】 Up to 10 hours of music playback on a single charge. With the charging case, an amazing 52 hours of playback is possible. Furthermore, it is equipped with a wireless charging function, allowing for easy charging anytime, just by placing it down. Reliable battery performance for commuting, school, and all-day use. 【AI Call】 To suppress wind noise, the earphones feature a windproof mesh structure and a patented design that effectively reduces airflow. The new wind noise cancellation algorithm reduces wind noise by up to 89%. Clear calls are possible even in strong winds. 【IPX5 Waterproof Performance】 IPX5 water resistance allows you to use them without worrying about sweat or rain. They are suitable for any exercise scene, allowing you to enjoy music comfortably. Also supports multi-point pairing, which allows you to pair the earphones with two devices simultaneously for seamless switching without any hassle.