1Forehead support can be adjusted to to assure tightness and comfort. 2Clever buckle design, easy to wear, dynamic adaptation to the patient's face shape. 3Multidirectional rotating elbow, multiple air vents to disperse airflow and reduce noise. 4Soft silicone material, double layer silicone can dynamically meet different face shapes. 5Anti-choke valve, oxygen interface, make treatment safer.
