Maximum audio resolution with Sennheiser Signature Sound: Enjoy premium music quality all-day long thanks to the headphone\'s audiophile-inspired 42mm transducer system and aptX Adaptive.Specific uses for product : Music Personalized sound via the Sennheiser Smart Control App: Adjust the sound to your individual listening preferences via the integrated equalizer, presets and sound modes - for a unique sound experience. Stay immersed in your music: Thanks to the headphone\'s Adaptive Noise Cancellation, you stay distraction-free - and with the Adjustable Transparency Mode you stay in touch with the world around you. Exceptional comfort and long battery life: Lightweight, foldable design with padded headband and deeply cushioned ear pads for long-lasting comfort - up to 60 hours of playback time with fast charging. Crystal-clear calls: The four digital beamforming microphones ensure high-quality voice pick-up and automatically suppress wind noise for optimized calls and easier access to the voice assistant.