Matchless Noise Cancellation: Liberty 4 Pro noise cancelling earbuds boast 7 sensors—6 sound sensors and 1 barometric pressure sensor—to capture noise from every angle. From planes to trains, enjoy a serene journey with 3× stronger noise reduction. Real-Time Adaptive Noise Reduction: These noise cancelling wireless earbuds adapt to your ever-changing environment every 0.3 seconds, ensuring optimal, seamless noise reduction around the clock. Effortless Touch Controls: The touch bar and display let you fine-tune the noise-cancelling levels of these wireless earbuds at any time with a simple swipe on the case. Studio-Level High-Fidelity Music: Feature the enhanced ACAA acoustic architecture, a 10.5mm bass driver, a titanium-coated tweeter, and a digital crossover for peak driver performance. Indulge in crisp, full-bodied sound perfected with nuances. Super Fast Charging: Liberty 4 Pro noise cancelling earbuds charge 2× faster than the previous models with the 5C battery. A 5-minute recharge offers 4 hours of playtime. Enjoy up to 10 hours between charges, extendable to 40 hours with the case. AI-Enhanced Clear Calls with 6 Mics: With a noise reduction algorithm and six mics, these wireless earbuds deliver clear calls wherever you are. Plus, a wind noise reduction algorithm ensures seamless, hassle-free communication, rain or shine.