Christmas lights string by Eurolamp, with 300 led lights, with a thickness of 3mm. They are green cable and emit natural white light, which is measured on the Kelvin scale with values from 4000K to 4800K. The tones of natural white resemble daylight and do not contain any other shades. 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. You can extend their length by connecting them to other bulbs.. They operate with electricity.