The advertised working time is 6 hours, as stated in the technical specifications. The actual working time is less an hour and a half, and the volume is hardly audible. They purportedly worked on testing for 3 hours and 15 minutes after I brought them in for warranty repair (I got them on Amazon). The opposite is true. Extremely dissatisfied with the pricey purchase and equally unsatisfied with the warranty service, which failed to save the union. The headphones perform superbly in every other respect.
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