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The documentation says: Talk Time With a single full charge, the CS510/CS520 will provide up to 13 hours of talk time. Talk time will be reduced when operating in wideband mode or if the headset is used consistently at a far distance from the base. The wide band is only needed if you are in a place that is using several of these headsets. Otherwise you can save the battery power buy leaving it off of wide band.
Sorry, there was a problem. Please try again later.Our CS510 and CS520 wireless headset systems feature up to 9 hours of talk time while operating in wideband mode and up to 13 hours when operating in narrowband mode. Please don't hesitate to contact our customer care group at www.plantronics.com/support if you have other questions!
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