Material:100%natural silicon; soft and comfortable with good impact resistance ability;
High efficiency activated carbon, large absorption capacity, low resistance;
3d human nature curve design, more spacious field of vision;
Five-point headband, fast plate buckle, easy and convenient, head uniform stress, no sense of pressure;
Unique sound transmission device, both working and communicating correctly;
RD40 international common interface, can connect canister with catheter.