Now this is humidification made easy! Just unscrew the top, place the XIKAR Humidification Jar in your humidor and it will slowly and steadily release a constant humidity of 70%. This 2 oz. jar regulates humidity for up to 75 cigars. Lasts up to 90 days before needing to be refilled. Re-fill with XIKAR PG solution. Safe, effective and very easy to use!