Travel Battery Wheel Spokes Bike Light Cree Super Brake Led Bicycle Lights Limited Real Cycling Accessories Bicicleta Installation is very simple,without any tools can be eassily fixed to the brake line Adjustable stainless steel reed switch responsive,derect and immediate reflection of each brake action,but does not affect bracking performance. Small sensitive nano brake light,is the best place to enhance traffic satety. Structure simple,lightweight . Also turned around and gesturing it.