1.Air conduction technology delivers music through your cheekbones, ensuring ears remain completely open to hear ambient sounds 2.Open ear can protect your hearing 3.Durable neckband with premium material can 360° bending without deformation 4.Ergonomic design for lightweight and easy to wear avoid drop off during sports 5.IPX4 waterproof 6.Liquid silicone encapsulated body(except control part) for long time wearing comfortably