From Smart Stuff:
Bicycle brake pads with LED brake light.
These are brake pads for ordinary "V" type bicycle brakes. Only they have a red LED light that lights up when you apply the brakes. The only back side is probably that they need batteries. Available from Swedish auto parts store Biltemas web shop for SEK 49:- (approx. USD 7:-) a pair. (Art.no. 27-287).
Labels: bicycle brake