• Optimal control of the microphone on the left and right to produce high accuracy of the reverse phase sound that has the effect of cancelling noise. High noise cancellation allows you to immerse your music in noisy environments such as trains and buses, or in environments where people are in the town or in cafes. In addition, it has natural external sound intake • Balanced from treble to bass, especially for vocals and musical instruments natural and clear. In addition, the Sony's proprietary technology "DSEE" (*) will complement the treble range that is often lost by compressed sound sources in the headphone to the equivalent of CD sound quality. It plays sound sources compressed by streaming playback, MP3, Bluetooth transmission codec, etc. with a good spread sound. * DSEE can be enjoyed by enabling functions from the "Headphones Connect" app • Compact design of the main unit and case. By reducing the protrusion from the ears, it enhances the feeling of wearing it with a smart appearance. It is comfortable to wear without getting tired even after long periods of listening In addition, you can choose from lavender, sage green and basic white and black with trendy dull colors • When noise canceling is turned on, the unit can be used for up to 7.5 hours, and the case can be charged for a total of 15 hours (*1). It also supports quick charging of 60 minutes of playback time (*2). It also has IPX4 splash-proof performance (*3), so you can use it without any problems even when sudden rain or sweat. *1 Fully wireless model includes case charging. Codec is AAC. The DSEE / Equalizer model has been set off, and all other functions are set by default. *2. Codec is AAC, noise canceling function is ON, DSEE / Equalizer models equipped with OFF settings and all other functions are all in the case only. It protects the main unit from splashing from all directions. This unit has an audio conduit (tube of the sound outlet), air vents, and microphone holes" • Handsfree calling on your smartphone, iPhone or PC. Noise suppression reduces ambient noise during calls and provides high call performance even in noisy environments. Furthermore, the wind reducing structure reduces wind noise from calls, and collects sound. Allows you to reach the caller's voice clearer and clearer * iPhone, smartphone, PC must have Bluetooth function and support HFP or HSP. Depending on your software or environment, it may not be compatible with this product