IPX4 water-resistant wireless earbuds with up to 6 hours of continuous playback. - Model Name: COTSUBU MK2+ - Color: NAVY - Water Resistance: IPX4 - Charging Method: USB Type-C - Multipoint Support - Battery Life: Up to 6 hours (earbuds) / Up to 24 hours (charging case) Small! Lightweight! Great sound! The popular "COTSUBU" wireless earbuds, with over 300,000 units shipped, have been updated with new colors. The sound quality is even clearer, and new features have been added. The series' smallest and lightest body achieves a "light" wearing comfort that makes you forget you're wearing them. The adjust-fit mechanism allows you to rotate the main unit to fit your ear shape for optimal fitting, ensuring a snug fit in any ear. Furthermore, the deep-fit design allows the earbuds to be inserted firmly into the ear canal, achieving high sound insulation that effectively cuts out surrounding noise even without active noise canceling. It also prevents sound leakage. The new seven color variations include the popular CREAM, SKY, SAKURA, and the standard KURO, plus the new colors LEMON, MINT, and NAVY. The main unit features a uniquely developed powder snow coating with a smooth texture, making it less likely to slip when removing the earbuds from the case and preventing fingerprints. In addition, the "auto-pairing function" that starts pairing simply by opening the charging case, the "single-ear mode" that automatically switches when one earbud is returned to the charging case, and the new "touch operation disable mode" that prevents accidental operation of the earbuds by touch have been added. The sound quality is high-quality, supervised by the audio brand final, and the sound clarity has been improved compared to the first generation COTSUBU. In addition to the basic performance that is sufficient for wireless earbuds, COTSUBU MK2 incorporates many convenient features and careful considerations that solve small problems you only notice when you start using them. Recommended for first-time wireless earbuds or as a gift.