Outstanding all-day wearing comfort: Developed for long-lasting music enjoyment, based on ergonomic research for in-ears. Outstanding sound quality: TrueResponse acoustic technology delivers the unmistakable Sennheiser sound, which can be customised via the Smart Control app - for a completely personal sound journey. Effective noise cancellation: Hybrid Active Noise Cancellation ensures an immersive listening experience and blocks out distractions in any environment. Extended battery life: Up to 8 hours of playtime and a further 20 hours with the charging case for uninterrupted sound throughout the day. Versatile charging options: Convenient Qi or USB-C wireless charging options for the case. Transparency mode: The surroundings can be perceived immediately without having to remove the earphones to grasp the situation. State-of-the-art wireless technology: Bluetooth 5.3 compatibility and Bluetooth LE audio for advanced connectivity, including Auracast Wireless Audio.