These luminous stones are white during the day, but at night they turn into blue luminous pebbles. Just put the pebbles on the edge of the walkway or flower beds, or use them for decorative vases, etc.^ 2. VERSATILE USE The luminous stones are ideal as aquarium gravel, shimmering stones in aquariums, ponds, courtyards, in water landscapes, as landscape decorations, in potted plants, to illuminate a path or a driveway.^ 3. HIGH QUALITY MATERIAL The luminous stones are made of high quality resin, durable, non-toxic, tasteless and non-radioactive. Fine workmanship and polishing do not create any sharp edges.^ 4. CONTINUOUS LIGHTS Please put all the pebbles in the sun for about half an hour to fully charge. Then you can see how bright they shine in the dark. They glow for about 3-6 hours in a completely dark room. They can charge repeatedly and light up.