This humidifier is ideal for keeping the optimal humidity level in your cigar humidor. In the pot is a crystal gel, brand Xikar. It is formed of acrylic polymer crystals that can both absorb and restore moisture. So just remove the lid of the pot and place it inside a humidor that can hold up to 75 cigars. The crystals will then do their service. You only need to check that the crystal level does not drop below the "Add line". In this case, demineralized water or propylene glycol should be poured to the level indicated by the "Full line".