The advertised working time is 6 hours, as stated in the technical specifications. Effectively function in less an hour and a half with audio that is hardly ear-splitting. 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. In every other way, these headphones excel.
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