... LEDs inside a frosted glass lantern. During the day, the lantern soaks up the energy of the sun, and during the night the little robot bugs glow, flickering ... they have power, or only when you shake the lantern. Don't worry about harming the little fellas - they aren't real. Your ... sleep, or just take a walk using the lantern as cool illumination as you go. The fireflies won't mind - in fact, they ...