The Healthsmart Cube Mate Humidifier is an ultrasonic cool mist humidifier that is compact, portable and is great for travel weighing only 1.12 lbs. The filter-free design features an adjustable mist dial, removable power cord, and fragrance tray for adding fragrances or essential oils. The tank of this humidifier measures 6.7 fluid oz. and measures 4.75' x 4.75' x 4.75' in size. Humidification automatically stops at refill level (unit includes red refill indicator light), and runs up to five hours.