The Bluetooth connection is stable even when the best sound quality is selected. Active noise canceling needs a master's ear. If a click or rustle appears in the music, especially audible during pauses, then it's time to experiment with the system adjustment slider. Headphones take the bar of operating time declared by the manufacturer calmly. Leaving 20-30% charge on the battery, the device is powered by the desktop clock's USB port approximately once a week. Charging itself takes 2-3 hours. Headphones are ready for any music and any preferences. Unusually, the sound seems to be too accentuated at low frequencies. Smartphone apps have a "Clear Bass" setting slider. The equalizer, DSEE Extreme, and other sound enhancement features also come in handy when you're constantly moving from genre to genre. Selected player adjustments on gadgets are also available. The purchase is expensive, but it is worth taking a look at the carefully thought-out technical flexibility of the system and the richest functionality. Perfectly adapted for travel, the headphones will not disappoint even sincere stay-at-homes. A wonderful thing that requires only careful individual customization. Sony WH-1000XM4, the cutting-edge audio technology of the current century, capable of reproducing the melodies of the past century so beautifully that the tracks familiar from childhood sound fresher than ultra-modern hits. In such cool headphones you breathe alone with the music.