Butterflies MoonLights are tiny purple butterfly-shaped LEDs, a great addition to a floral arrangements or craft project. The thin plated copper wire allows for easy placement and the strand is submersible in water! There are 20 5/8" purple lights, on a 6-1/2 foot wire. The lights will work approximately 30 hours with 3 AA batteries, which are not included. The small battery case is easy to hide. Only the light strand can be immersed, the battery pack must be kept out of water. Immersing the strand in water reduces battery life by 7 to 8 hours.