Automatic & Timer FeedingAuto fish feeder can be operated automatically or manually, making fish-keeping easier. It is great to feed your fish at a scheduled time (once or twice per day), at the same time, you can also feed manually and experience the fun of feeding. Battery Operated & Two capacityLarge capacity: 210ml/100g; Small capacity: 100ml/50g. Powered by 2 x AA batteries (Not included), can last for 2~4 months. This auto fish feeder is great for daily use whether you are at home or away. No more worry about fish feeding even you are on a business trip. Two Different Fixed MethodsOur fish feeder is designed with 2 install methods to meet different needs. 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. Moisture-ProofThe hopper with Moisture-resistant design keeps food fresh and dry from getting wet or jammed. The fish food dispenser is suitable for various fish foods such as flakes, pellets, powders and strips. Simple Install MethodAttention: It is recommended to test the amount of food poured out is sufficient or not by sliding the control slider before using. Using a fisher clip, install and hold the fish feeder on the edge of the tank, make parallel with the tank.