BOLD COLORS: Our blue ceramic-style C9 holiday lights come alive with the bold, true color tones of LED technology, filling your space with festive charm. CONNECTIVITY: C9 ceramic bulbs can be effortlessly linked end-to-end or stacked at the plug up to 43 sets, providing versatility for both small and large spaces. COMMERCIAL-GRADE: Our pre-lamped C9 LED string lights are commercial-grade quality with non-removable bulbs and use full-wave rectification for a consistent, flicker-less glow. ENERGY-EFFICIENT: These festive indoor/outdoor holiday lights are highly energy efficient, reducing utility costs up to 90% by using only 4.8 watts per string! EASY INSTALLATION: With pre-lamped strings, there's no need to install any individual bulbs. Simply pull these out of their bag and start wrapping your home in delightful, colorful lights. OVER 25 YEARS: Since 1999, Novelty Lights has been a trusted leader in the holiday lighting industry. As a US-based company, our customer service team is close to home and available on your schedule. We’re here every business day, dedicated to preserving the joy our products bring. Illuminate your indoor and outdoor spaces with the vibrant colors and soft glow of our ceramic style pre-lamped C9 holiday strings on green wire! Featuring opaque plastic C9 shells over 5mm wide angle LEDs, these blue lights bring the true colors of LED without the harsh brightness seen in many other sets. Designed to cover a substantial area, these C9 holiday lights outdoor span a generous 25 feet with 12 inch bulb spacing. They are built with a stackable, fused plug and end sockets, so you can expand your display in all directions to almost any length--up to 43 total sets from a single outlet! Whether you're decorating for the holidays or crafting intricate lighting designs, these holiday lights are versatile, safe, and dependable for both indoor and outdoor use. These outdoor/indoor C9 LED lights aren't just beautiful, they're also energy efficient. Consuming only 4.8 watts per string, they offer a cost-effective solution for your decorative lighting needs. No special power supply or adapter is needed as rectification to eliminate flickering is done right on the string itself. Pre-lamped strings make installation a breeze. All bulbs on this set are built in and non-removable, so you can simply open the bag and begin wrapping your display. Shatterproof plastic and negligible heat output make these strings easy to handle during installation and safe for use in up-close applications like stair rails, mantles, and indoor trees.