Sony ULT Wear Wireless Noise Canceling Headphones WHULT900N/B WHULT900N/H. Model: ULT Wear Wireless Noise Canceling. To maximize noise-canceling performance, the ULT Wear Wireless Noise Canceling headphones incorporate two technologies: Personal Noise-Canceling Optimizer, designed specifically for you, and Atmospheric Pressure Optimizing, designed specifically for air travel.
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