Time is life when minutes count , CPR mask can be the difference between life and death . Time is life when minutes count , CPR mask can be the difference between life and death . This shield contains a transparent rescue mask that is fitted with a one way valve to assure your safety by blocking fluid or contaminant transmission . The mask has elastic earbands that fit over the ears of the victim .Available with heart-shape plastic box . FS-102BX CPR micro shield, with a heart - shape plastic box.