1. Our design concept is designing earphones with special ANC for airplane use. Low-frequency sound indirectly arrives at the ear canal via ANC and high-frequency sound directly arrives at the ear canal without ANC, so that the earphones not only meet ANC requirements, but also have a high-quality sound. 2. It has a hole for MIC to collect sound at the center of the rear housing. The concave shape is designed to make the MIC collect sound better. 3. The ergonomic curved cavity design and oval sound nozzle will provide user comfort and good quality of sound.