• Balanced from treble to bass, you can enjoy natural and clear vocals and instruments. In addition, the Sony's proprietary DSEE technology complements the treble range that is often lost by compressed sound sources in the headphone with equivalent to CD sound quality. It plays sound sources compressed by streaming playback, MP3, Bluetooth transmission codec, etc. with a good spread sound • Compatible with a dedicated app, you can choose from 8 presets such as "Relaxed" or "Bass Boost" using the "Equalizer" that can be customized to your preferred equalizer settings • Smooth low-repelling urethane foam earpads with less wrinkle. Soft, comfortable ear pads are lightweight and comfortable to wear • Up to 50 hours of music playback Furthermore, it supports quick charging with a 3 minute charge (about 5.5 hours of playback(*) for about 10 minutes of charge) • Handsfree calling on your smartphone, iPhone or PC. * Smartphone, iPhone, PC must have Bluetooth function and support HFP, HSP. Depending on your software or environment, it may not be compatible with this product