F.Dorla Mini Desktop Office Fan & Portable Dual Bladeless Small Air Conditioner Water Air Cooler Powered by USB & Battery ( Purple) Mini Air Cooler & Humidifier - Add water or ice in the box to feel more cool and keep the air humid Great for Refreshment - Add some essential oil or scents to make the air more refresh. Upgraded Version - Adjustable Dual Bladeless Fan.Portable and Lightweight,perfect for office, home and outdoor camping, picnic etc. Size: 116mm x 109mm x 136mm/4.56'' x 4.29'' x 5.35''(approx) Powered by USB cable(included) or 3 * 1.5V AA Batteries(battery not included)