I am cruising around looking for gadgets and gizmos to accessorize my new cycle. I was looking into getting a headlight and/or taillight modulator. The taillight one flashes 5 times quick then stays lit for 3 seconds then repeats as long as the brake lever is held in. The website that sells the particular headlight one I am looking at says it is legal in all of the USA on the federal level and no state can make them illegal. I am guessing it is DOT approved in some way, but the product description doesn't say in those terms. I don't know if they are telling the truth. Anyone know if they are in fact legal? Thanks.