I walk my dog early in the morning (before work) and sometimes later in the evening. These lights are bright and alert others to my presence.The price is good for four of these lights. They come with a clip and a small silicone strap the size to go around the handlebar of a bicycle, or your finger. For something larger, like your arm, you would have to improvise something. I use a carabiner to attach it to my jacket.I like that it does not need replaceable batteries. I wish it came with a charging cord, but it uses the same size as my Kindle.