Ambu Res-Cue Keyprovides protection to perform a safe CPR.Thekey ring contains a transparent plastic mask with a one-way valve to protect responder from possible pathogen transfer during breathing rescue. This one-way valve protects rescuers and helps them overcome any hesitations to start resuscitation in an emergency situation by preventing direct contact with the patient's mouth, nose, and face. Additionally, this handy mask allows for the sanitary sharing of adult, child, or infant manikins and prepares students for the use of a mask during an actual resuscitation.