2001-2005 - converts the outside light on your trunk into turn signals leaving the inside light as a brake light.
2006-up - adds turn signal to the unused inside bright filiment.
Gives you an additional visible turn signal on the bike when towing most trailers. 
Completely plug and play and easily reversible. 
Check your local laws regarding both a red and amber turn signal on the rear of your bike.  
Kit includes components to modify both sides.

Fitment: 2001+ Honda GL1800  - US models only