Christmas lights string by Aca length 2.1m, with 20 led lights, with a thickness of 2mm. They are silver cable and 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. You can control them remotely with the included remote control.. They operate with batteries.