Questions about Sony WH-CH520

No, it also has no corresponding input or output. It's called wireless/wireless. But googled here: "In principle, any Bluetooth headphones are suitable for use in an aeroplane. But if you fly a lot, regularly and long distances, you should pay attention to the following functionalities: Fit and wearing comfort, noise cancellation (ANC) and battery life (or fast charging function or recharging via charging box)."

The Sony WH-CH520 headphones are suitable for adults and have an on-ear design. This means that they rest directly on the ears instead of fitting around the ears like over-ear headphones. The cushion rings are small and lie directly on the ear cups, without a round cushion with an opening in the centre like over-ear models.

Yes, I tested it, it works.

with this model there is no background noise cancellation. you hear what the person next to you is saying - always depending on how loud you listen to your music. with models with noise cancellation, you hear little or nothing from the person next to you.

Hello, such specific questions can be asked to YouTubers who specializes on unbiased evaluation of products, including disassembling, pointing out weak points as you raised. Sony WH-CH520 is an affordable, 50hr use between charging, no noise suppression, general purpose use over the ear headphone, that I use for late night use without disturbing others. Such use do not need expensive noise suppression or professional qualities. Please buy it use it and if it breaks before guarantee period or fair usage life, take both case incidents to the vendor and Sony, they will provide you with satisfactory services and your findings can go into their future design policies. 21st century consumer product quality and support services can become Customer driven if customers try working with vendors and manufacturers.