The sound you want - 35dB Smart noise cancellation* | Dual-device connectivity | Wireless charging | 28h long battery life.The earbuds adopt the dual active noise cancellation technology with feedback and feed-forward microphones. They effectively cancel ambient noise and reduce excess noise in the ear canal. Noise cancellation can be as deep as 35dB*.When travelling by metro or aeroplane, it effectively cancels engine roaring and other vibration noises inside the car/cabin, making your trip quiet and comfortable.The AI algorithm judges the scene based on ambient noise level and usage habits. Adjust the noise cancellation depth for different environments.