1. Noise reduction mode, it works here by the way - the sound is excellent with concert recordings, the bomb is clear, 3-4 hours of operation at 80% -100% volume, then when listening to Trance 70-80% volume is normal, at 100% volume there is a rumble and wheezing in the left earpiece; 2. OFF mode such a feeling of turning off the bass and therefore 7 hours of work, only audio books or voices to listen to; 3. Sound transmission mode has bass, even some third-party noise gives extra. effect for the audibility of third-party sounds, but I can no longer give an assessment to your taste .
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