Christmas lights string, with 576 led lights, with a thickness of 4mm. They emit light in various colors and are black cable. They have IP44 protection, which means they cannot be penetrated by solid objects larger than one millimeter and also cannot be penetrated by water with high intensity. They allow you to choose between various lighting programs, depending on your mood. Additionally, they have music and a timer to adjust their operating time. Finally, they have the ability to extend their length by connecting them to other bulbs.. They operate with electricity.