Assertion: headphone's battery | /r/CapableOf | die its rechargeable battery
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text: The MM 450 also has very good active noise cancellation (no, not as good as the QC15's, but still very good), can be used passively (via an included cable) when the battery dies (or when you'd rather not drain its rechargeable battery), includes a very nifty TalkThrough feature that allows you to hear the world around you (using its built-in stereo microphones), can be used as a Bluetooth headset, and has control buttons with which to easily control your calls and music.