The Ocean Wonders Aquarium is an exclusive toy found at Babies R Us. It has heavy straps that attach to the side of the crib. The straps are very sturdy! My daughter has stood up in her crib and pulled on it with no problems. The aquarium has music, lights, bubbles, moving fish and buttons for baby's entertainment. The large shell at the bottom right side of the aquarium is big enough for little hands learning coordination. My girl learned to turn the music on and off quickly. On the back there are switches so parents can switch the music or change setting so the aquarium can suit the toddler's needs such as no movement of the fish and music only. The only thing that I have struggled with is finding a screwdriver in my house to change batteries. I would highly suggest this product to any parent looking for something to sooth their little one to sleep.