Moisture prevents design, moisture-resistant hopper keeps fish food dry, won't get wet or jammed.It accommodates most types of food, including flakes, pellets or crumbles.Two intalled methods, you can choose two methods to install the auto fish feeder.One is to intall it with the pedestal, the other is paste it on the tank cover with the double-side sticker.Make sure the fish feeder is fixed over the water level and not make it fall into the water.Two different fixed methods: the feeder has 2 install methods for you to choose.One is to fix the feeder to the tank wall by using the holder. Another is to paste the feeder with double-side sticker on the tank cover.Easily add food: adding the fish food at the top of the fish feeder, not to take down the food bucket,so you can increase or decrease easily the amount of dispensed food.