Bests & Worsts Reviews from Amazon

Did I mention these are the best? :) Of very many? :) GREAT, so far. I will update. Of all the collars these have lasted the longest and I've only had them since Oct 7, today is 10/31/16. So not saying much for the others. They are by far the brightest. I got green. Dogs see red & green the best. When JoJo stays close enough to me, she usually does even off leash, no need for a flashlight. It's awesome now when Annie's off leash I know exactly where she is. She can go pretty far and still be seen. I have never NOT been able to see her. Another upside, I noticed when leash walking it slows cars down (speed limit 30 is not obeyed). All other collars would have been disposed of if not for Amazon Prime easy peasy return policy. I would have spent HUNDREDS trying to find ones that work. There is also a LIFETIME GUARANTEE! Money well spent. Size M comfortably fits 18" neck 75# dogs. The size chart is spot on. https://smile.amazon.com/gp/product/B01F6O4TQK/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1