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. The sealed pouch offers a tamper-evident, waterproof closure assuring the first responder a clean, ready to use device. Ideal for long term storage in first aid kits, vehicles and equipment cases.