PATENTED SAFETY AND DURABILITY: Our string lights feature a unique, patented design with removable filaments and shells technology to ensure safety and longevity. Simply unscrew the plastic shell and pull out the low-temperature filament for replacement, with no exposed metal or risk of electric shock, and no need to replace the entire bulb. This outside lights design reduces loss from bulb breakage, promotes sustainability by minimizing waste, and meets the concept of environmental protection. IP65 WATERPROOF & SHATTERPROOF: Our commercial grade string lights for outside are designed to withstand harsh weather conditions, including rain, snow, sun, wind, snow, dampness and extreme temperatures. They are safe from breakage, ensuring long-lasting performance even in challenging environments. The patio lights outdoor waterproof feature extends their lifespan and enhances their durability, making them ideal for all year-round outdoor use. ULTRA ENERGY SAVING: 500FT ST38 backyard ligh