Safty Comes First. 100% Whole Set UL(Underwriter Laboratories Inc.) approved ,CERTIFIED - The whole string lights is completely UL approved (including string wire, LED bulbs and low power consumption output plug), Stay Cool even long time use. including led beads, coppr core insulated wire and power adapter. PERFECT SIZE AND SUPPORT 4 SETS END TO END CONNECTABLE: 300LEDs 108FT And Support Max 4 Sets End to End Connect. Each one length is 108 feet (99ft first led to last led + 9ft extension cord), Freely 1-4 sets conntect according to your demand. the max expandable length is 432 feet., You Can Buy 4 Sets To Connect Together, Enough To Cover Larger Area. 8 Lighting Modes and Automatically Memory. Combination, in waves, sequential, slogs ,chasing/flash, slow fade, twinkle/flash and steady on, these 8 Lighting Modes Available for Choice for this LED Christmas String Light and It Remember Your Last Setting Automatically. (Short press the power button to change the working mode of the light string.) IP55 Heavy Rain And Snow Protection. Withstand any kinds of wet weather, for example heavy rain and snow, This is designed to use for indoor and outdoor. Wedding, Holiday, Christmas, Garden, Yard,Lawn, Fence, Porch, Tree, Roof, Deck, patio outdoor use. Perfect string christmas lights. Perfect Decoration. The light create romantic and warm atmosphere when the lights on.Perfect for indoor and outdoor decorations. party,Valentine's Day, wedding, home, window,festival, restaurant, hotel,commercial building, shopping center etc. If you have any questions about the products, please contact us in time. Christmas light string