I have used this light several times now and they didn’t disappoint. They alert the cars around me since I run on the neighborhood roads around my house and they also provide light to see the road. They charge easily and are super lightweight and I even forget they are there if I run when it’s still a little light out. Each light comes off easily from my shoe but stays firmly in place while moving. The price is a little steep but so far they have been worth it. They are small but provide ample light to even see potholes in the road and also little animals like toads, they even helped me avoid a dead squirrel in the road in a poor lit stretch.