On August 19,
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[8] A model to supersede QuietComfort 2 Revision 2,
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[9] but the similarities end there. Bose worked to refine the Acoustic Noise Cancellation engine so each earcup would use two microphones instead of one (there is now acoustic noise-cancelling microphones on both inside and outside the earcup). The new headphones also have a slot for a AAA sized battery, as well as a "High / Lo" reversible switch for appliances with a low volume, and for applications that have a higher volume output,
wholesale jordan shoes, to better help the listener with volume control. In addition,
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[10] The QuietComfort 15 was released August 20, 2009 and is priced at $299.