I ordered these for our cats and they are really fun but as soon as you take them out of the water to dry you will notice rust from the batteries, it would be a real hassle to take the batteries out every time you use them you. There is mention of a weight that can be removed or added depending on where you want your fish to swim underwater. I still haven't figured out where they are or if they even exist, the weights don't come with the product so they must be in the fish. They work well for our cats but they are cheaply made and my 4 pack came in 3 purple and 1 green.
M SANMERSEN Piano Mat - 53" x 23" Musical Mat with 8 Animal Sounds - Dance Mat for Kids - Touch Play Dance Mat Toy - Gifts for 3 4 5 6 Year Old Girls Boys
8 Review
Kidzlane Light Dance Mat Technology
8 Review
Exquisite Kidzlane Floor Piano Mat Keyboard: The Ultimate Musical Experience for Kids
9 Review
π Versatile Mat Electronic Music with Adjustable Lights - Perfect for Christmas and Birthdays
7 Review