Our CPR Micro shield is in a Sealed Orange Pouch and provides physical barrier for mouth-to-mouth resuscitation. Single use only. Designed to protect the rescuer while aiding in the administration of proper CPR technique, it has become the standard by which others are judged. The positive one-way valve inside the airway enhancing bite block is designed for maximum protection of the first responder. It also assists in keeping an open airway while performing the head-tilt, chin-lift maneuver.