The Dogness Pet Fountain Automatic Water Dish holds up to 1 Liter and continuously flows the water to aerate and reduce stagnation, the replaceable triple-layer filtration system ensures the water is fresh and odor-free. The ultra-quiet pump continuously pumps and the super-strong suction cups keep it firmly attached to the tank. The light illuminates the water level window so you can clearly see when it's time to refill, however, should you forget the light will change from blue to red as a visual reminder. The pump is designed to shut off if the water competently runs out to prevent it from overheating. It comes equipped with one replaceable filter that lasts up to 6 weeks of continuous use. Powered with an AC power adapter and 5’ft. Cord.