I would have given 5 stars but since it took be awhile to figure out how to get it to work, I deducted a star. First off, you have to find the battery. Mine was located about 2 inches to the left of the "L". You must feel the battery compartment for the thin piece of plastic they insert to keep the battery from making contact. Once this is removed, it worked like a charm. You get 3 blinking speeds, fast, slow and no blink. This socktail hat is so soft and thick. Even if the battery does die you can still wear it. The lights are very small an indiscreet. You can't beat the price with a stick!