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Slide the switch on the battery holder to ON position. An LED lights up when noise cancellation is switched on. If the light blinks or becomes dim, change the battery.

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Slide the switch on the battery holder to ON position. An LED lights up when noise cancellation is switched on. If the light blinks or becomes dim, change the battery.

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Slide the switch on the battery holder to ON position. An LED lights up when noise cancellation is switched on. If the light blinks or becomes dim, change the battery.

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