Christmas lights string by Entac, with 240 led lights. They emit cool white light, which is measured on the Kelvin scale with values from 5000K to 6800K. The tones of cool white are more blue 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. Their operating time can be adjusted by the included timer and they have the ability to extend their length by connecting them to other bulbs.. They operate with electricity.