The Sony WH-CH520 wireless headphones' Digital Sound Enhancement Engine (DSEE) technology restores music with high frequencies and gradual fading for a more authentic sound. You can even adjust the sound of the music to your own taste with the EQ settings in the Sony Headphones Connect app, and thus enjoy a personalized listening experience. 360 Reality Audio Certified optimizes your music experience by analyzing the unique shape of your ear Sony | in the Headphones Connect app. You get to experience and enjoy a complete, immersive music experience. Listen to your favorite music for up to 50 hours straight without worrying about running out of power. If the battery of the headphones is low, you get 1.5 hours of listening time with just 3 minutes of quick charging. The headphones' adjustable headband, soft ear cushions and lightweight design guarantee a perfect fit and longer wearing comfort.