Reduce Noise By Up to 98.5% Liberty 4 NC noise cancelling earbuds have a high sensitivity in-ear sound sensor, an oversized driver, and an innovative noise isolation chamber that cancels up to 98.5%1 of noise for peaceful travel. Maximum Quiet, Anytime, Anywhere Adaptive ANC 2.0 analyzes external and internal noises via in-ear and external sound sensors, with an additional 512-order FIR filter to effectively remove unwanted noises in real-time, for more precise and instantaneous noise cancelling. Crisp Sound with 3 More Detail 11mm custom-tuned drivers deliver crisp, detailed sound that feels like you're switching on HD for your ears. Experience Hi-Res wireless audio and LDAC technology that transfers 3 more2 data than regular Bluetoothbringing wireless music to life. IPX4 Water-Resistant: Don't let a sudden downpour or an accidental spill ruin your commute. Liberty 4 NC wireless noise cancelling earbuds come with IPX4 water-resistance to give you peace of mind during your travels.