Extended Battery Life Powered by a robust built-in rechargeable lithium-ion 350mAh battery, these headphones boast an incredible 250 hours of standby time, providing longevity and reliability for your on-the-go lifestyle. Rapid Charge, Prolonged Playtime Revel in extended playtime with up to 15 hours with Active Noise Cancellation (ANC ON) and an impressive 20 hours with ANC off. Charge for just 1 hour using the micro-USB cable for a quick and convenient power boost.