First aid mouth to mouth breathing mask� is a personal protective equipment designed to protect rescuers from exposure to infection when in close contact with victims. Item NO.: TW8340H Payment: T/T 30% and balance before shipment Product Origin: CHINA Color: Transparent Shipping Port: Xiamen, Shanghai, any port in China Lead Timeï¼? 30 days Emergency cpr face shield breathing barrier How to give CPR and save a life without putting yourself at risk of infection. Use a� CPR face shield. CPR face shiled� is a must when performing CPR or rescue breathing as they help prevent cross-contamination with the person receiving CPR. The semi-transparent face shield allows you to monitor the patients color and response through the mask. Each mask has a one-way ventilation valve with filter which helps protect you during CPR. Each CPR keychain comes individually packaged with one CPR mask and a sturdy nylon keychain pouch which is easy to carry. What are breathing barriers? A flat plastic barrier that lays across the victim\'s mouth and nose. It conforms to the face and allows the rescuer to blow through a hole in the middle. The hole has either a one-way valve or a filter to protect the rescuer, depending on the brand. Why choose flat barrier over CPR mask? A flat barrier is probably the better device on the market because it is easy to use and carry. It is difficult to learn and very hard to master the proper technique to seal the CPR mask onto the face.