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Active noise cancellation for Beoplay H9 3rd Gen – Bang & Olufsen Support
Amazon.com: Bang & Olufsen Beoplay H9i Wireless Bluetooth Over-Ear Headphones with Active Noise Cancellation, Transparency Mode and Microphone – Black - 1645026 : Electronics
What is the battery life of my Beoplay H9? – Bang & Olufsen Support
Bang & Olufsen Beoplay H9 Gen 1 Wireless Review - RTINGS.com