Cigar Swami humidification products are precision engineered to maintain optimal conditions in your humidor, ensuring that your cigars rest and age exactly how they’re supposed to. Cigar Swami Cigar Guru Crystal Humidifiers are filled with unique crystals which, when hydrated with the Cigar Swami PG Potion, will ensure that your humidor stays at approximately 70 percent relative humidity. Each of these units is self-regulating, so in addition to releasing water vapor, it will also reduce the humidity level in your humidor if it becomes too high. Remember to never use tap water or 50/50 propylene glycol solution to refill your Cigar Swami humidifier; the only way to ensure that your humidifier is working at its full capability is to use Cigar Swami PG Potion.