The Blackhole Cat Litter Mat Interactive Swimming Robot Fish are water activated swimming robot fish toys. As soon as you drop them into water, they immediately start swimming. And when you pull them out of water and tap them dry, they will stop flicking their tail (swimming) and you can put them back in the box. There are 4 brightly colored fish in each pack - but they can vary as to colors and patterns - so what's pictured here or what we got in the video could vary. The fish come batteries and then there are also LR44 batteries and 1 installation tool also included. Charlie and Trigg have been exposed to robotic fish before and loved them, so I knew they would love these too. They are fun and different and add a rotation in our play routine that both cats seem to enjoy. However, in general, I wouldn't say they hold their attention for very long. In our review video below, I included footage of my sister Amy's cats, Ash and Addie, being exposed to them - and they didn't much care for them. So it could be hit or miss with your cats. Although they are not a kids' toy, I think if your cat didn't end up liking them, a kid could play with them supervised. But, there's always the satisfaction guarantee... SATISFACTION GUARANTEED – If for any reason you’re not 100% satisfied with your swimming fish cat toys, simply contact their support experts for a new replacement or full refund. What do you think about the Swimming Robotic Fish from Blackhole Litter Mat? Do you think you'll get some for your kitty? Why or why not?