The colour-changing silicone desiccant absorbs moisture and keeps the air in the AMS 2 Pro dry.
Once the desiccant has absorbed sufficient moisture, the yellow particles inside turn purple. When the desiccant turns purple, it must be replaced with a new one, or the moisture-absorbing desiccant must be dried and reused.
Note: The desiccant should be removed from the sealed transparent plastic bag before insertion into the AMS 2 Pro.