Anker SoundCore Liberty 4 NC Wireless Headphones, ANC 2.0, Hi-Res Sound, LDAC, Bluetooth 5.3, Black Reduces noise by up to 98.5% The Liberty 4 NC noise-cancelling headphones feature a high-sensitivity in-ear sound sensor, an oversized driver, and an innovative noise-isolation chamber that cancels up to 98.5% of noise for quiet travels. Adaptive Noise Cancellation Adaptive ANC 2.0 technology makes real-time calculations and adapts to your ear canals and external environment for maximum silence in the midst of hustle and bustle. Clear sound with 3× more details Custom-tuned 11mm drivers deliver consistent, clear, and detailed sound. Experience Hi-Res wireless sound and LDAC technology, which transfers 3x more data than regular Bluetooth - bringing wireless music to life. Personalized sound Not everyone listens the same, so use HearID 2.0 to find the perfect sound profile for you. If you want to change it, the equalizer is fully adjustable or choose from 22 presets to match your sound. Generous autonomy A single charge is enough to enjoy uninterrupted entertainment for 10 hours. The playback time of the headphones is extended by up to 50 hours with the charging case. Other features: - Fast Pair and MultiPoint Bluetooth 5.3 connection; - IPX4 certified water resistant; - with 6 microphones and an AI algorithm that enable clear conversations;