Exercise without restraint is specially designed for strenuous exercise. With adjustable silicone ear hook, you can freely adapt to various ear types, and strenuous exercise is easy to control.Painless wearing is just right. Comfortable and ergonomic rear-hanging wearing method is adopted, and the three-point stable wearing principle is skillfully used, so that it is comfortable and painless.The dynamic and surging bass adopts 10mm large moving circle sound generating unit, and the comprehensive professional acoustic adjustment makes the bass thick and powerful, the medium and high frequency clear and bright, enrich the level of listening sense, and let you feel the presence of sound at all times.