Black Friday Continuous music playback time: Max. 30 hours(NC ON), Max. 40 hours(NC OFF)Continuous communication time: Max. 24 hours(NC ON), Max. 28 hours(NC OFF) Battery, Light will dim gradually throughout the product's use, so the given battery life is an estimate. Using lower brightness settings will extend battery life. Battery, Up to 9 hours of surfing the web using a mobile data network Battery