Being LEDs , these blue C7 string lights are part of our Commercial grade series. With twin pin coaxial with an rubber O-ring connections for a waterproof seal and 20 gauge wire this string light has 25 points of light. The lighted length is 25' long with 12" between each light and 12" lead cords. Using substantially less power than the traditional incandescent set, connect up to 420 watts with one UNIT OF C-APCORD-1G TO FUNCTION PROPERLY. POWER CORD IS NOT INCLUDED with the set of lights. UL listed for indoor and outdoor use. Each set is rated at 2.4 watts.