Have you ever noticed a small red bulb on your Christmas lights? If so, do you know what it is for?
It appears many people have no idea what its actual purpose is. However, a woman has now given an explanation for it on TikTok, leaving scores of followers amazed.
She shared a video with a demonstration of her putting the light to its intended use. You start by simply removing a single bulb and replacing it with the red one.
