This is a great product to have if you have fish. There is 4 different feeding times you can set this to. I love how simple it is to use, just fill it up set the timers and let it do its thing. This is perfect if you go on vacation or traveling cause you don’t have to worry about how or who will feed your fish. You can either stick it to your tank with the double sided tape or you can attach it to the tank with the clamp. This takes two AA batteries which comes with it. I received this product free in exchange for my honest review.