This is an item of stationery (paper or writing goods), or other small merchandise such as good-luck charms, mascot straps, et cetera.
If you've got a kid who doesn't much care for the idea of taking baths, maybe Dokin-chan can help! Install the two AAA batteries (included and replaceable), flip the switch to "on," and Dokin-chan will zip around in the tub, powered by a little propeller beneath her feet. It's bathtime fun for anyone!