Holiday Essentials 100 Red & Green Bulb Light String Set with Green Wire. UL Listed - Conforms to UL Standards. Safe for Indoor & Outdoor Use - 120 Volt. This Light Set consists of 2 independent circuits of 50 lights. Each circuit can be made to steady burn or flashing mode by replacing a regular bulb with a Red Tip Flashing Bulb (2 Red Tip Flashing Bulbs are included with this set). Total Length of Light String: 20.75 Feet. Lighted Length: 18.5 Feet. Spacing at the ends: 3.5" end on female adapter - 12" end on male adapter. If one bulb burns out the rest will remain lit. Fuse-protected, end-to-end connector allows up to 5 sets to be connected together in a continuous strand. Use these green and red mini lights on windows, trees, wreaths, garlands, outdoor bushes and many more applications!