Using these Harry Potter 2D string lights is super easy. First, you'll need to get 2 x AA batteries as they aren't included. Open the battery compartment and insert the batteries following the correct polarity. Once the batteries are in, switch on the lights and watch the Hogwarts crests glow. You can hang them anywhere you like - on your wall, above your bed, or even in a window. When it comes to maintenance, keep them away from water as they're not waterproof. If the lights seem dim, it's probably time to change the batteries. Store them in a dry place when not in use to make them last longer.