40(8+32) Hrs Extra-long Battery Life Wireless Ear Buds: Run a Marathon with Your Favourite Music – 8 hours music time on a single charge, the 500mAh charging case extend the usage time to 40 hours, and a 15-minute fast charge provides 90-minute uninterrupted playback. Whether you’re on the move, working or relaxing, the T12 earbuds can always offer excellent audio without the hassle of frequent charging. Battery freedom is the true wireless freedom!