UL LISTED:Strictly tested and meets the US requirements of string lights UL safety standards to ensure & maximize the safety. Whole set string lights including string wire, incandescent bulbs and plug have been certified by UL.With durable insulated wire, our product could be used for a long time. | 100 CHRISTMAS LIGHTS SET:Our christmas lights includes 100 transparent warm white lights,total 21 feet white wires string lights,lighted Length is 19.6 feet.Each bulb is 2.36 inch apart,19.6 inch lead wire,4 inch end connector.Comes with 2 flasher Bulbs & 2 extra bulbs, you can change one of the bulbs to a flash bulb and then it can become a flash mode. | CONNECT UP TO 5 SETS: With the end sockets, thease 100 count traditional clear christmas lights could be extended to 5 sets.In other words, it can be connected up to 105 feet,enough to cover larger area.Just use multiple christmas lights together to create the length you need. | IP44 WATERPROOF&HIGH QUALITY:IP44 Waterproof designed white christmas lights are perfect for both indoor and outdoor decorations.All of our christmas lights are constructed with high quality material and designed to withstand rain or snowstorm,so you can confidently leave them on display through summers and winters. | WIDE APPLICATIONS: Old-fashion incandescent christmas light set,creates a warm and festive atmosphere,surely lights up your house,let your home become a fantastic sight to behold in your neighborhood! With white wire,sure to brighten up your bedroom, living room,dining room,yard etc, as well as perfect for Christmas tree,Garland,Home,Patio,Wedding,Party,Festival Decor.