Hear ID ANC, Adaptive Noise Cancelling, Adjusts to Noise Level, HearID ANC automatically adjusts the noise cancelling for different noise levels around you. Playtime, A Soundtrack for Your Day, Recharge Liberty 4's case with a wireless charger or USB-C cable. The earbuds' playtime is extended to up to 28 hours with the case and you can get up to 3 hours of listening from a 15-minute charge. 6 Mics for Clear Call, Exceptional Call Clarity, 6 microphones and a noise reduction algorithm filter out background noises and enhance your voice in real time so you can be heard clearly. Soundcore App, Convenient Customization, Access Transparency mode, customize press control to suit your listening style, and enjoy calming white noise when you want to rest or concentrate on your tasks.