He’s so engrossed in his reading he won’t notice when night falls. And it won’t matter, because when the sun goes down, his book lights up. Just be sure to leave him where he’ll soak up rays by day. Cast resin frog is hand-painted and UV-treated for use indoors or out. Takes 1 AA battery (included). On/off switch. About 8"w x 6"h x 10"d.