Christmas lights string by Adeleq length 3.7m, with 50 led lights. They are copper 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 IP20 protection, which does not allow direct contact of our fingers with the lighting elements. 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 batteries.