Holmes Cool Mist Humidifier with Humidistat 2 gallon capacity 10-15/16" w x 17-9/16" d x 16-21/32" h - Comfort and peace of mind who could ask for more; Easy-to operate unit runs for a minimum of eight hours on one tank so you need not worry about middle-of-the-night refills. Adjustable humidistat allows you set the level that's just right for you. Treated filter provides Microban anti-bacterial protection and Arm & Hammer odor-reduction. Operates up to eight hours on one tank; Adjustable humidistat; Microban antibacterial protection.