Christmas lights string by Nedis length 25m, with 200 led lights. They are black cable and 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 IP65 protection, which means they have complete protection against dust, while water propelled with great force (e.g. pressure hose) cannot enter. They allow you to choose between various lighting programs, depending on your mood, and adjust their operating time with a timer.. They operate with electricity.