UL Certified Guarantee 100% Safety: Our Christmas string lights were strictly tested and completely fulfill the requirements of UL safety standards with a 30V low output voltage (lower than the maximum voltage safe for humans,36V). The LED bulbs keep at a low temperature state so even after long hours of use they are still safe to touch for children and pets. Just plug into an outlet and use it without worry. Upgrated LED Light Bulbs: We upgraded the LED chips, which making the light bulbs super bright, especially suitable for Christmas effects. Such as Christmas tree, patio, bush, party, wedding, home, window, balcony, bar, restaurant, shopping mall, etc. Create a festive atmosphere for you. Waterproof Design for Indoor Outdoor Decorations: The led Christmas lights are made of premium LED bulbs and sturdy dark green wire which is designed to withstand rain and snow, making it ideal for both indoor and outdoor decorations, such as patio, balcony, garden, dining room, living room, kitchen, etc. Note: the plug is Not waterproof, take care to keep it away from water. 8 Lighting Modes & End to End Connectable: These Christmas decorative lights feature with 8 different lighting modes, including Combination, In waves, Sequential, Slow Glow, Chasing/Flash, Slow fade, Twinkle/Flash, Steady on. And with male and female connector allows up to 4 strands to be connected together to illuminate a wider area. 4 strands will give you 392ft and 1200 LEDs to use and will only take up one electrical socket.