i have been looking at the different light kits that have the tail light flash when you hit the brakes. For the last three (3) years I have been seeing these at dealerships, rallies and swap meets. The price starts at around $175.00 and goes up to $325.00. Just not willing to dig through the cobwebs and spend that for a neat piece of bling. Along comes good ol EBay! I purchased 8 of these "brake light modulators". Cost $1.80 each. Yep, less than 2 bucks a kit. I put one on my Rocket and another on my buddies Roadster. Works fantastic. 4 quick flashes followed by 4 long flashes, then a constant brake light. Best $2 I've spent. The modulator itself is smaller than a match box. Simple hook up. Hot (red) wire in and out. Same with the ground (black) wire. Just thought I would share with my other Captains!