1. Compact fit, light and easy to hold, aesthetic feeling overflowing, the upper and lower shell over UV process (anti-scratch) + double weight feel more. 2. All-weather ultra-long battery life about 5 hours full power earphones alone, 20 hours ultra-long battery life of both ears (charging compartment to charge the earphones four cycles), lasting listening. 3. F13 real brass ring horn balance pleasing to the ear. 4. U-shaped tail plug charging mode rejects the probability of bad charging.