Christmas lights string by Eurolamp, with 300 led lights, with a thickness of 3mm. They emit warm white light, which is measured on the Kelvin scale with values from 2400K to 3800K. The tones of warm white are more yellow compared to natural light. 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.