Specifications:One-way breath valve design, prevent the air exhaled by the wounded from entering the rescuers mouth.Mainly used for first aid, so that rescuer and the wounded are isolated to prevent cross-infection.It is the great tool for artificial respiration, widely used in first-aid kits and medical trainers. Instructions:When use this tool, keep the sick or wounded breathing unobstructed.Put the mouth in the middle of the respiratory membrane into the mouth of the wounded.Blow the air from the other side into the wounded. Item Name: CPR MaskMaterial: ABSFeatures: Hygiene, Easy to Use, Portable, One-way Breath Valve DesignNote: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Package Includes:1 x Storage Box1 x CPR Mask