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Hi DTF, Thank you for your inquiry! Once you have set the EQ and other settings of these headphones through the Sony Headphones Connect app, customized settings will retain on the headphones even if the application is not in use, unless the headphones are initialized back to factory settings. With our XB910N, you will get closer to your favorite music with the exceptional bass performance and noise cancellation with EXTRA BASS and Dual Noise Canceling technologies. You will also experience ultra-clear call quality, thanks for Precise Voice Pickup Technology of your headphones, which combines two built-in microphones with advanced audio signal processing. They also support Multipoint connection and have a battery life that can last up to 30 hours. Hope this helps! Vincent
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