Green Wire Xmas Lights: Christmas 100 LED string lights, use UL-certified 29V low-voltage plugs to ensure the safe use of the product. The outdoor Christmas lights has 10 FT leading wire, and the light string is 25 FT, total length is 35 FT, the bulb spacing is 4 inch. The string light using green wire, which looks more natural and suitable for Christmas tree and wreath.