Inexpensive, compact barrier with mouthpiece and filtered one way valve for CPR. All the features of the basic face shields PLUS: Bite block airway tunnel with extended mouthpiece to assist the rescuer in maintaining an open airway when performing the head tilt, chin lift maneuver. Shield measures 6”l x 10”w when open, just 2”x1 ½” x 7⁄8” when stored in its case.