Dailyart Halloween Spider Lights, Blue 3D Spider Halloween String Lights (30 LEDs, Battery-Powered, 11feet/3.5meters) 11feet/3.5Mspiderstringlightisconsistof30 3D clear spiders,spiders arespacedevery4inch. Two Modes: flashing and steady. Battery-powered, requires 3AAbatteries (not included) instead of charging plug. They can be used anywhere. Non waterproof battery box. It's supposed to be used indoors. Blue lights are perfect for Halloween, theme parties, carnival, festival, celebration and special occasion. You can also wrap them around the trees, door frames, windows and horror themed parties, or use them to create haunted maze in your house.