Not flaws, but rather observations - The cover quickly enough is discharged by itself. If, for example, you don’t use headphones for a week, then you simply lose 70 percent during this time. - The battery in the case is 1.5 full charges of the headphones themselves, which is compensated by a really good headphone battery. - Active noise cancellation here is more marketing than real. The effect is subtle. ate: Actually Active Noise Cancellation does work. The other day I flew in an airplane, it really helps to cut off the background hum and noise (not voices).
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