Holiday Essentials Ultra-Brite 100 Count Clear White Bulb Light String Set with White Wire. UL Listed – Conforms to 2016 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 Feet. Lighted Length: 18.56 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 lights for weddings, garden parties, patio events, bedroom, dorm, office, kitchen, around windows, on white trees, and many more applications!