LED Light up Safety Dog Collar. Winter Designs. 2 Sizes Available. High Visibility LED Light up Dog Collar Great for Walking your Dog at Night, or Routine Outside Time. The LED Light has 4 Modes; Steady On, Fast Flashing, Slow Flashing, and Off. 48 Hours of Continuous Light. Batteries Included! Choose from 2 Sizes for the Best Fitting Collar for Your Dog. 4 Colors and 5 Unique Christmas Designs for your individual preference. Durable Material designed to Withstand Outdoor Weather Conditions. Simple On/Off Button. Easy Length Adjustment. Sm-Md ranges from 9-14 in. Md-Lg ranges from 14-20 in. Model has 17 inch neck size and wears a Md-Lg size Collar.