These fun solar-activated kinetic yard stakes are produced from weather- and U.V. resistant prismatic film that produces a dazzling array of colors when in motion and are equally attractive while still. In addition to the brilliant colors they give, SunSations Spinners require no batteries for operation and will perform their spectral dance of light anytime thet are in direct sunlight. Note: overcast conditions and indirect sunlight may prevent the motor of the SunSations Spinner from activating. For best results angle the spinner so that it faces the sun and watch it magically twirl!