Set of 12 Flashing Light-up Blinking Christmas Bulb Pendant LED Costume Necklace Bring on the festivities with these light-up Christmas bulb necklaces. This flashy piece of neckwear hangs from a woven nylon string, with a strong plastic clasp and bright flashing red, green and blue Christmas bulb pendants. Just flip the switch on the back of the bulb to light up. Great for ugly Christmas sweater contests. Enjoy!!