Marshall's Monitor II headphones deliver high-performance sound with advanced noise cancelling technology to block out external noise, so you can concentrate on the music. They last for up to 30 hours of listening time with noise cancelling on, or 45 hours without. Advanced ANC Advanced active noise cancelling technology continually pinpoints and blocks external sound, so you can focus on what matters most; the music. Marshall Sound Custom tuned 40mm drivers deliver the signature sound of audio experts Marshall. M Button Press the M button and switch between three equalizer presets. And it lets you get hands-free help from your smart device's voice assistant, all without needing to glance at your phone. Marshall Power Recharging by USB-C, they'll keep going for up to 30 hours of playtime with ANC switched on. Compact and foldable, these are the ideal headphones for life on the road. Marshall App With the Marshall Bluetooth app installed on your mobile device (available on iOS and Android), you can customise your listening experience.