The Laerdal Pocket Mask is especially designed to be used by theprofessional rescuer and first responder. It offers superior protectionfor both rescuer and victim. The Laerdal Pocket Mask combines alow resistance one-way valve with a disposable hydrophobic filterto help prevent the passage of liquids and secretions. The oxygeninlet facilitates delivery of supplemental oxygen to breathing and nonbreathingpatients.