All you need to create a rainbow is a little sun with this Solar-Powered Rainbow Maker With Genuine Crystal! It attaches easily to your window and creates an explosion of rainbow patterns when the sun hits it! And Feng Shui says it brings great Chi into your home. Just remember to place in direct sunlight and adjust the position as the seasons change to maximize the effect. And enjoy! Dimensions: 2"(w) 5.5"(h) 1.5" (L).