Purchased 2 sets and placed them in a wide bush outside my house. I got the multi-color lights for Christmas. You can set them several different ways to flash, stay steady, etc. Once you set the timer they turn on and off in about six hours. No need to go out to turn the on and off. They take 3 D batteries. The battery box seems to be waterproof. It has rained and snowed since they were put outside. One battery pack will power 2 sets of lights. That is about 60 feet of lights. I got another set to put on my back porch next year. I will use the back porch lights year-round they should look festive in the summer.