These warm white LED fairy wire waterproof lights are 100% waterproof - including the battery pack! Perfect for any event like weddings, anniversaries, or just when you want a little glow in a corner all year round! These string lights are made of thin copper wire and can bent into desired shapes like coils or balls, or they can simply take the shape of the vase or container you put them into. Fully waterproof and powered by a waterproof battery pack. Submerge in a vase for a dazzling centerpiece, or layer them behind sheer fabric. Since they are powered by battery, you will not need to be close to a power outlet. Each string of warm white LED submersible lights is 6-feet long and is powered by a waterproof 3x AA battery pack. Batteries not included. Not expandable. Light spacing 4".