When you switch on the headphones without playing music, an annoying residual noise (hum) remains even with the ANC (Active Noise Cancellation) switched off. With ANC on, everything is the same, just louder. I usually turn it off because it's inconvenient and because ANC basically makes the output quieter. The microphone is terrible. I just can't talk to them on the phone. The other person will never hear what I say. The pairing is often disconnected for no apparent reason. Sometimes when multiple devices are connected at the same time, the audio will stop intermittently and then start up again in less than a second, which is very annoying. Really destroys my concentration. They almost fell off my head several times too. These are the worst headphones I've ever had. Also, it would be cool if Amazon (or the vendor) stopped putting a bunch of completely different products on the same page. It seems that two styles (that sell for over $100) are now on a separate listing, so that's a good thing. This makes it very difficult to find reviews on the actual product you are planning to buy. Plus, it clouds the water with a star rating. It is very difficult to find out whether your product has a problem that everyone is complaining about or not. This misleads customers and makes it impossible to find reviews of listed products.
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