On Amazon.com where you can now buy this
Robo Alive Junior Baby Shark Battery-Powered Sing and Swim Bath Toy 宝宝玩的洗澡玩具,打折后 for just $12.97!

Place the baby shark in the water and the water-activation technology allows it to swim – and of course, it plays “Baby Shark,” so your little one can sing along while they bathe!
This toy features an auto-off, power-saving mode, so it will shut off after the song has played for 4 minutes. To reset it, just pick it up out of the water and put it back in and it will start again!