Assertion: headphone's feature | /r/HasProperty | built-in eq
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Source sentences:
text: Best of all, the buds produce consistently clean detail and warm, lively instrumentals and vocals that can also be tweaked through special features (e.g. built-in EQ, music presets) in the companion app for personalized sound.
text: Other winning features of the AirPods are the included charging case, which greatly increases the AirPods’ effective battery life; the built-in microphones; and the first-party integration with iPhone and iPod.