1. Our goal is to design the most comfortable earphone. Therefore, we have designed as semi-in-ear type with an air cushion back chamber that is very flexible to match different ear sizes. 2. The angled front cavity and sound hole ensure ear ergonomics. 3. Metal ornament with screw type design. Front cavity sound can directly arrive at the ear. The air in the back cavity can be exported. Making sound solid and strong. It offers both visual effects and sound effects. 4. The way of wearing is different from most earphones. Lying down inside ears to make it “invisible” and allow users to wear it while sleeping. 5. Where it touches the skin, it employs soft rubber for total comfort.