Umbra Casamista Portable Humidifier, Avocado The Casamista portable humidifier by Umbra Attaches to any standard 12-ounce bottle of water (not included) and creates an ultra-fine vapor; works with water-soluble essential oils Powered by USB with the included cable, or four AAA batteries (not included) 2-3/4 Inch by 3-1/4 Inch by 2-3/4 Inch Designed by Alan Wisniewski