The sound you want. Enjoy a world with less background noise. The earbuds utilize dual active noise cancellation technology with feedback and feedforward microphones. They effectively suppress ambient sounds and reduce excessive noise in the ear canal. Noise cancellation can reach up to 35 dB. During subway rides or flights, engine noises and other vibrations in the car or cabin are effectively suppressed, ensuring a smooth and comfortable journey. When you relax in a café, ambient sounds are effectively muted, allowing you to enjoy your quiet moments in the afternoon. In relatively quiet environments, such as libraries and offices, ambient noises are dampened, so you can enjoy your time alone. When the transparency mode is activated, you can still hear ambient sounds without having to take the earbuds out. Switch to the "voice enhancement" mode for clearer voice quality, allowing you to have a relaxed conversation with your friend using your headphones. The 9mm composite diaphragm coil provides an excellent sound experience. After tuning by a professional from Xiaomi's internal sound lab, the sound in the high frequencies is clear and undistorted, while the low frequencies are rich and pure, refining the sound quality.