Xactly Krypton True Wireless Bluetooth 5.0 Earbuds | Premium Drivers | Integrated Dual Microphone | NRC Noise Reduction-Bluetooth 5. 0 technology delivers clearer sound and extended range while providing in-call stereo sound.-With certified Noise Reduction Coefficient (NRC) features, these headphones will block the unwanted noise out so you can zone in.-Bluetoothª WT 5.0 Chipset with 3-4 hours of play time / 6 hours of talk time on one charge-600 mAh charging case Ð case will charge earbuds 3 times before recharge is needed Ð buds charge within 1 hour-Why Xactly Life: 100% Satisfaction Guaranteed. And a portion of every sale helps us to bring clean drinking water to those in need through our partnership with planet-water.org-XACTLY is committed to 100% Satisfaction Guaranteed and helping you explore our beautiful planet. We're also committed to improving it. As a for-profit, for-good company, we have started creating partnerships with charitable foundations that are changing the world.