Designed for small rooms and runs up to 24 hours per tank filling; Two speed settings for optimal comfort; Contains an Antimicrobial Product Protection Additive; 2-speed settings; Filter treated with antimicrobial protection and Arm and Hammer baking soda; With two speed settings for optimal comfort, this Cool Mist Humidifier is ideal for small rooms. It produces a refreshingly cool, invisible mist. Model HM1761TG-UM. Holds 1 gallon of water.