According to the box, 6ft. however I believe thats the entire length of the wire. From the first letter to the last it is 17.5 inches.The letters measure 1/1/2 inches in width and 1 3/4 inches in height. I just realized this one lights up different colors, first red then green, then blue, then it does a multi-color shuffle. The one I have for myself is clear so sorry for any confusion.