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Featuring Sony's best-ever noise cancellation, the WH-1000XM4 boasts improved noise reduction and the most significant evolution in noise cancellation performance in the 1000X series headband. Evolved Driver Unit: The newly developed driver unit produces rich sound from low to high frequencies. Utilizing Walkman technology, it achieves improved reproduction of subtle sounds, enhanced spaciousness, and improved sound localization. Optimal call performance for online meetings and classes. AI-powered, high-precision voice pickup technology ensures accurate and clear call quality even in noisy environments. Furthermore, it incorporates a design that prevents wind noise from interfering. Comfortable Fit: In addition to its sophisticated design, it offers a comfortable fit that allows for extended use. Microphone performance improvements: High-performance hands-free calling is achieved through beamforming technology using four microphones (two on each side) and AI.