This Portable Air Conditioner Fan Serves Multiple Functions. It Can Function as a Regular Desk Fan, a Cool Mist Humidifier, or an Air Cooler Fan When You Add Ice & Water to the Tank. This Ensures You Stay Refreshed & Avoid Dry Air, Enhancing Your Comfort During Hot Summer Days. with a 300ml Large Water Tank, It Can Operate for 3-4 Hours When Filled. Additionally, It Can Work for Two Hours Using a 10,000mah Power Bank. Perfect for Extremely Hot Weather in the Western United States, Its a Versatile Cooling Solution. Minimum Quantity: 2.