In-ear detection tells your earphones when they're in your ear or when you take them out. If your earphones detect that you've taken them out, your current audio selection will automatically pause. When you put them back in, the audio will automatically resume. The 2 outer mics work together with the inner mic to block out surrounding sounds while you're on a call. ANC (Active Noise Cancellation) is a technology That reduces unwanted ambient sounds ENC (Environmental Noise Cancellation) filters out background noise during calls to ensure clearer communication. ENC activation in phone call mode. After the earphones are connected for the first time, the charging case can be opened to connect with your device, making it more convenient to use. True Wireless Earbuds with Amazing Stereo Sound.