Product features: This aquarium feeder is an ideal helper for aquarium hobbyists on holiday outings or in a hurry, suitable for grain and thin feeds. The amount of each feeding can be adjusted and controlled according to actual needs. The product automatically feeds every 12 hours/24 hours (comes with two feeding box - 50g/100g), which can meet various needs. When in use, the feeding machine can be placed upright or fixed on the side of the fish tank, easy to operate. Operation instructions: 1.Pull out the feed box in the direction of the arrow. 2.Remove the lid of the feed box and add about 2/3 of the feed. 3.Close the lid (the lid is aligned with the feed box slot) 4.Open the battery box cover and install 2 new AA batteries (do not place used batteries or rechargeable batteries). 5.Attach the feed box on the feeder with the outlet upward, fix the feeder towards the fish tank and keep it level with the fish tank. 6.Adjust the size of the outlet as needed. 7.The round button is pressed every time for manual feeding, which does not affect the automatic feeding setting. 8.Dial to 12H, feed at 12 hours interval while dial to 24H, feed once in 24 hours interval. To install the fish feeder on the tank: Use clip: Put the clip on the feeder, put it on the edge glass of the fish tank, hold the clip to tighten it. Use magic sticker: Remove the clip on the feeder, tear off the protective film attached to the Velcro paper, stick it on the battery cover, and stick the other side on the tank lid, or stick it in a position that does not affect the feeding. Notice: The product has a built-in electronic circuit, and can not be dropped into water. Specifications: Large food drum: 210ml up to 100g food Small food drum: 100ml up to 50g food Auto feeding: 12/24H Operated: 2 AA 1.5V batteries(not included) Package list: 1xfeeder 2xfeed boxes 1xTape 1xclip 1xmanual✓Operated by 4 AA batteries (not included): When you clean the food box, just remove it, thoroughly rinse with warm water and clean the drum. Make sure the drum is completely dry before adding food. ✓ Food type selection: This timer feeder can only be used for dry food. Ideal for pellets, granular, strip and flake fish food. Please place it above the higher tank to protect food from moisture. Then fix the tank lid, leaving only one hole. Put some aquatic plants in the hole, let the food fall into this hole, and the fish will come to eat the food. Two installation methods: for open fish tank, fix the feeder with the clamp, install it on the glass wall of the fish tanks; for closed fish tanks, attach the Velcro on one side to the lid of the tank, the other side to the base of the feeder, and stick both sides together. (Note: When using Velcro, you need to wipe the surface clean and then attach it, finally install the feeder.). ✓Feeding manually or automatically: auto mode can set the time reasonably, feeding every 12 hours or every 26 hours, help you automatically feed when on vacation or on a business trip. Meanwhile, the one-click manual feeding will not affect the preset times. ✓Double food box optional - 100/210ml: the 210ml large capacity food box, can hold 100g fish food while the small one 100ml, can hold 52g fish food. Choose one according to your outing time, hold enough food to feed your fish when you go out.