CoolHome Mini USB/AAA Battery Powered Handheld No Leaf Air Conditioner Bladeless Portable Refrigeration Fans Desktop Cooler (Purple) Material: durable hard plastic and soft sponge Built-in sponge design, it can absorb cool water and freeze to generate cool breeze Great for using in office or home. More safe and convenient for children Drop little essential oils or perfume to the sponge,the wind will make you more refreshing Powered by USB cable (included) or 4 * AAA batteries (not included)