The present invention relates to a reminder device to indicate to a user a point in time to administer a medicament by means of a drug delivery device (100), the reminder device comprises:—a container (12) extending in a longitudinal direction (1) having an inner cross-section (14) matching with a cross section (52) of a disposable component (50) of the drug delivery device (100), wherein the container (12) is adapted to accommodate at least two of the disposable components (50),—an indication (20) attached to the container (12), extending in longitudinal direction (1) and comprising at least two indicating items (22a, 22b, 22c, 22d) separated in longitudinal direction (1) by a distance (d) that corresponds to a geometric parameter (D) of the disposable component (50).
