<prompt> Sticker shown on Vaccine ls indicate:-EfficacyExpiryViabilityCold chain  <response>: - Sticker shown on Vaccine ls indicate maintainance of Cold chain - Vaccine Vial Monitor VVM Rules for VVM use in India: Rule 1: if inner square is lighter than the outer circle, the vaccine may be used Rule 2: If inner square is the same color as, or darker than the outer circle,vaccine must not be used. WHO Grade Outer Circle Inner Square Inference Grade I Blue White Vial can be used Grade II Blue Light blue Vial can be used Grade III Blue Blue Vial CANNOT be used Grade IV Blue PurpleBlack Vial CANNOT be used 