70% humidity guaranteed for a humidor containing 50 to 100 cigars. The Credo self- regulated humidification system is based on a physico-chemical process whose molecular mechanisms allow a rigorous water evaporation control The principle is based on the creation of melange of water and tensio-active substances which limits the potential of the evaporation of the water itself. It Works! humidity is tamed and the amateur is carefree. Size 16.5 x 6.5 x 2cm