: Runs for up to 25 hours on low thanks to its SUPER LARGE capacity of 2.5 liters. The soothing moisture helps quickly relief congestion and dry throat.br - : LEVOIT listened to feedback from humidifier customers and upgraded to a easy top-fill design. No need to turn the water tank over or spilling water all over the place. Just ONE-STEP to remove the cover and easily fill the tank.