Happy birthday musical party lights The Happy Birthday lights are a set of 10 lights. The lights are shaped like presents/gift boxes. The presents/gift boxes are different colors such as red with a green bow, blue with a red bow, yellow with a green bow, and white with a red bow. The present/gift box lights are 2" high. The electronic controller plays the Happy Birthday tune while the lights flash to the tune. The electronic controller has a volume button for the Happy Birthday tune. The Happy Birthday lights are for indoor and outdoor use. The bulbs stay on, even if one bulb goes out. Comes with 2 replacement bulbs. There is 12" of space between each present/gift box light.