Not in the ear, reduce the pressure inside and outside the ear, less damage to the hearing, increase the comfort, (not in the ear is a safe sports earphone) Free your hands.Built-in 170mAh battery, you can listen to music continuously for 13 hours, the battery has a protective plate to better protect the battery life.Intelligent AI sound conduction, voice control, driving calls, listening to music, a sentence, there are music and audio resources inserted.The quadrilateral structure speaker increases the veneer area, the sound transmission is more effective, the double-sided speakers emit sound, and the 3D stereo sound effect is presented.Lightweight body design, remove the in-ear front cavity structure, how can you be restrained when you are young, how can you not move freely, capacity storage.Memory steel wire skeleton, automatically adapt to the head shape. It will not be deformed by any twist, safe and comfortable.