Opened for inspection. Please be aware that the outer box may have stains or tears, but the contents are in good condition. 【Equipped with Dynamic Driver + Micro Planar Driver】The dynamic driver and micro planar driver used in "Frost" excel in mid-high frequency performance, delivering clear and natural mid-high tones while maintaining a powerful bass effect. 【Sapphire Glass Faceplate】BQEYZ's new glass faceplate design. Combining highly transparent crystal glass with an ice-blue base, it shines like a jewel when light hits it from various angles. The transparent texture vividly expresses the Frost pattern. 【Balanced Tuning】The BQEYZ acoustic engineer team conducted thorough research on the characteristics of the unit, combining the listening opinions of experienced audio engineers and senior users, and conducted multidimensional tests based on individual listening experiences, 3-frequency control, resolution, frequency response range, etc. Tuning specialized for natural vocal sounds brings a sense of airiness and extended high-frequency characteristics. It helps to improve sound clarity, reduce distortion, and improve overall sound quality. Frost has become a well-balanced home run hitter.