The MOMENTUM 4 Wireless perfectly combines incredible wearing comfort with elegantly streamlined style. With an outstanding battery life of up to 60 hours, smart features for effortless ease of use, and take anywhere fold-flat design, it's the ideal companion for amazing sound wherever you go. Sennheiser Signature Sound Powered by Sennheiser's audiophile-inspired 42mm transducer system for exceptional high-fidelity sound Top-Tier Battery Life Outstanding battery life with up to 60-hours play back time with fast charging. Adaptive Noise Cancellation and Transparency Mode Advanced noise cancellation automatically adapts your sound to your surroundings. Transparency Mode lets you hear external sounds without removing your headphones. Premium Comfort Lightweight design features a padded headband and deep cushioned earpads to ensure exceptional and long-lasting wearing comfort. Customizable Sound Listen your way with built-in EQ, presets, sound modes, and the Sound Personalization feature, which tailors the audio to your individual hearing, all accessible via the Sennheiser Smart Control App. Crystal-clear Calls Four digital beamforming microphones ensure high-quality voice pick-up and automatic wind noise suppression for optimized calls and easier voice assistant access (Siri and Google Assistant).