Use to decorate your Christmas tree, mantle, stairway, doorways, outside tree, bushes, doors, windows and the roof-line. Each light strand is 33 feet in length and you are able to connect up to 22 sets end-to-end. These sets have a long life, last up to 25,000 hours of bulb life and stay lit even if the bulb is loose, burnt out, broken or missing! Energy Star with 76% Energy savings compared to standard mini lights. UL Certified. Flicker Free Lighting. Indoor / Outdoor.