This should explain a little more how it works.. Take note that they say it makes a difference WHERE you mount it and WHERE to ride the bike along the strips (could be some non-manual readers could just be riding in the center of the road and expecting it to work). I also seen to get yourself an electromagnetic magnet and wiring it to your brake light.
Motorcyclists often get stuck at red lights that never end, because the sensors that cause the light to change to green aren't sensitive enough to know that small vehicles are present. These sensors work by generating an electromagnetic field, and sending changes in that field when a large mass of metal passes through it. The problem with motorcycles is that there often just isn't enough metal to do the trick.
The Green Light Trigger "fools" the system by creating disturbances in the sensor's electromagnetic field. Basically, the trigger is a powerful magnet that you fasten to the bottom of your bike (for instance, to the center stand crosspiece). When you move across the sensor, the magnet in the Green Light Trigger causes enough of a disturbance in the field to allow the light to change as though you were a car.
Now, installing a magnet on your bike doesn't automatically make you look like a Buick to these sensors. The only way we could do that is to weld a few hundred pounds of steel to your bike, and that might cause handling issues (not to mention styling problems). The technique to use with the Trigger is to locate the sensor (you can usually see saw cuts where the coils were buried in the pavement), and MOVE the magnet across the coils. Stopping dead on top of them will do very little - it's the moving magnet that does the trick. In addition, there are installation tips (included in the package) that show you how to install the magnet for maximum benefit.
The Green Light Trigger is available in two versions - the Original, with an estimated effectiveness of 80% or more of triggering balky stoplights, and the HP (High Performance) version, with a 25% stronger magnet estimated to trigger 95% of stoplights.
http://www.cyclegadgets.com/Products/pr ... tem=GLTRIG