I looked into a similar unit a couple of years ago. The problem it had was that the transmitter (that sends the brake signal to the light) was built into a special tail/brake light bulb that came with the unit; you had to use that accompanying bulb. This precluded the use of better (e.g. LED) bulbs, and to top it off, a replacement bulb was something like $50 or $60. Obviously, I decided to pass.