Under normal conditions, higher humidity levels rise and settle toward the top of your humidor. The HumiFan provides intermittent air circulation to prevent stagnant conditions inside your humidor, allowing your cigars to "breathe" by redistributing the air inside your humidor to diffuse inconsistent humidity levels, providing a more consistent and stable environment for your cigars. The HumiFan is designed to work with cigars resting directly against the intake of the unit. Runs in 15 second cycles every 15 minutes. Uses 4 AA batteries (included).