DESC: Household heating systems in the winter and air conditioners in the summer rob the indoor air of its natural moisture. Your lungs and respiratory tract are dependent on moisture to function effectively. The vaporizer provides proper humidity levels to keep your respiratory system moist and help relieve cold and flu symptoms. Features include: 15 hours operating time; night light; automatic shut off when water is low; safety vents to regulate steam flow quietly; carbon electrodes which do not rust or corrode; triple wall construction and cool to the touch cap for safer handling.