How to Use: To fill the feeder, simply unscrew the top lid, and pour pet food into the extra-wide-mouth hopper; To fill water, tip it upside down, pour water through the bottle's mouth, tip it right side up, and then attach the base. ;How the Automatic Pet Feeders Work: The gravity automatic pet feeders are not electronic feeders so that they have no electronic mechanism. The gravity feeder works by the use of earth's gravity to fall the food into the bowl or drip water into the bowl. When the food is eaten by the pet from the bowl more food will be dropped in the bowl due to gravity. ;Perfect Companion For Pets: Large capacity: 3.8L/1Gal. Made of food-grade plastic material with non-toxic, BPA free, durable, and recyclable. they are available for small pets for 7 days, or big pets for 3 days. Fill up with water and food, you can easily go out, work, or short-term travel with confidence. ;Easy to Clean: All detachable design easy to clean Separable storage bucket, the internal structure can be removed and washed one by one. Please do not use hot water for cleaning. ;Warm Tips: To make your pets healthier, it is recommended to clean the bowl and the feeder and waterer for your pet regularly.