The Nighthowl, Blue, LED Safety Dog Collar Necklace, Adjustable To Keep 4 Legged Friends Of All Sizes Safe & Visible In The Dark, Weather Resistant, Durable, Made With A Flexible Polymer Tube, Illuminated 360 Degrees By 2 Bright Blue LED's, Glow & Flash Modes & Can Simply Slide Over Your Dog's Neck For Hours Of Nighttime Fun & Safety.