The WNL MiniKey CPR Key Chain features an easy to use barrier with a one-way valve preventing mouth-to-mouth contact. This barrier will prevent cross contamination between the patient and rescuer. This shield can be used for both adults and children. The one-way valve prevents contamination which allows for safe mouth-to-mouth and mouth-to-nose use. The clear vinyl allows for the rescuer to monitor the victim. The MiniKey is latex free. These face shields are packaged with a key ring which makes them available at all times. Every staff member of a school should have the MiniKey.