The signature Marshall sound you've grown accustomed to is delivered in Major IV. You won't want to turn off the rich, unmatched sound that is produced by dynamic drivers that have been specially adjusted to produce roaring bass, smooth mids, and brilliant treble. 32 Ω is the driver impedance. Range of Frequencies: 20–20,000 Hz. Quick-charge capability allows for over 80 continuous hours of wireless playback; 15 minutes of charging will provide you with 15 hours of listening time. These headphones are genuinely long-lasting. The tenth hour is just as comfortable as the first when you're immersed in your music thanks to improved ergonomic design. The ear cushions from Major IV fit your ear shape more accurately and are softer to the touch. Major IV is now easier to charge than ever thanks to its wireless charging capability.