Outstanding all-day wearing comfort: Designed for extended music enjoyment, based on ergonomic research for in-ear headphones. Exceptional sound quality: The acoustic TrueResponse technology delivers the distinctive Sennheiser sound, which can be individually adjusted via the Smart Control App for a personalized audio journey. Effective noise cancellation: Hybrid Active Noise Cancellation provides an immersive listening experience and blocks distractions in any environment. Extended battery life: Up to 8 hours of playtime and an additional 20 hours with the charging case for uninterrupted sound throughout the day. Versatile charging options: Convenient wireless Qi or USB-C charging options for the case. Transparency mode: The surroundings can be instantly perceived without having to remove the earbuds to assess the situation. Cutting-edge wireless technology: Bluetooth 5.3 compatibility and Bluetooth LE Audio for advanced connectivity, including Auracast Wireless Audio.