LED Light up Safety Dog Collar. Fancy Argyle Design. 2 Sizes and 2 Colors 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! And Easy to Replace. Durable Material designed to Withstand Outdoor Weather Conditions. Simple On/Off Button. Easy Length Adjustment. Choose from 2 Sizes for the Best Fitting Collar for Your Dog. Fancy Argyle Design and 2 Great Colors! Sm-Md ranges from 9-14 in. Md-Lg ranges from 14-20 in. All Collars have 1 inch width. LED Bar is 8 in. long.