These are great! I use them for visibility at night with motor vehicle traffic: Slipped it onto the over the head strap of my headlamp- I turn it on and glide it down the strap to the back so motorists can see me when my back is turned to traffic. Get 2!Love them. Use on my Hobie CatI use it on my dog at night while playing frisbee. I'd have no idea where he is without the light. Turn the light on and huck the kong frisbee. Lasts forever even with 45 min every night use.The light worked well in the beginning. However, the dog returned one evening without the plastic covering. It needs better engineering to turn the light on and off,Excellent light for my dog have on his harness. You should have a hook and loop option.