LED Dog Collar for Pet Safety.. Flashing Dog Collar with LED "Jewels" Comes with Extra Batteries. Light Up Your Dog Today This collar is 1 inch wide and neck sizes are Small (13.5-17 inches), Medium (15.5-20 inches), and Large (17-22 inches). This collar is too heavy to be suitable for miniature breeds Batteries last 60-80 hours and an extra set is included. Batteries are standard CR2032 button batteries Collar has 4 modes controlled with a switch on the collar - Solid Light, Fash Blink, Slow Blink, and Off With our Light Up Dog Collar your dog is visible up to 1,000 feet. Keep your best friend safe. Excellent quality nylon collar manufactured to our high standards. Not a cheap collar that will only last weeks.