The violet, almost UV, light makes day glow objects, including the snail itself glow in their own colors. It is cute and small. Can be used for things like checking money. The cheap plastic construction is not strong. One can't see by it well. I wish it had 2032 cells and was a bit brighter. I my... The violet, almost UV, light makes day glow objects, including the snail itself glow in their own colors. It is cute and small. Can be used for things like checking money. The cheap plastic construction is not strong. One can't see by it well. I wish it had 2032 cells and was a bit brighter. I gave my first one to a 2 1/2 year old. I hope they re-stock the four color set. All children and some adults will want one. It is not strong and probably has no automatic shut off, so the batteries will go the first time a child leaves it on. Read more