Incandescent bulbs. 30 feet long, 10 sockets, outdoor - weatherproof. Includes 15 bulbs (5 extra). Bulbs spaced 3 feet apart. Heavy-duty 16/3 SJTW cord. Connect up to 13 strings of lights. 130 volts, E26 medium base. 11 watts S14 Incandescent bulbs. Wet location UL listed.