This light is bright & attached to my dogs Ruff Wear harness perfectly. It also attached to my dog’s 1 inch collar & doesn’t slide around on it. I like the 3 colors. We can use the red color on the beach during turtle season. I have two dogs so it is nice to be able to change colors when they are both running around in the dark. The blinking feature helps cars see us better when we are walking in the early morning or evening.