Using these string lights is easy. Just plug them in and choose from the 8 flashing settings to set the mood you want. They can be hung up indoors at weddings or birthday parties, or used to decorate a girl's room. For outdoor use, you don't have to worry about rain as they are waterproof. When the lights arrive, take a quick look to make sure they are in good condition. But remember, don't cut the lights or the plastic buckle. To keep them in good shape, store them in a dry place when not in use. And if you notice any color difference between what you see on the screen and the actual lights, that's normal because of monitor settings.