7 string bubble light string in original box

7 string bubble light string in original box. As you can see in the video the lights work correctly as when the bulb heats up the liquid they start to bubble. The red light has very short bubbles due to the weight of the red color dye. This is a vintage piece from the 1970's that bring back memories for me of what we had in our house as a kid. If 1 light goes out the others remain on.