Go Beyond (TM) Adjustable LED Light Pet Safety Neck Collar for Dog Cat Visibility & Safety (Proved Harmless for Pets, 14.5 inches to 20 inches) BRIGHT LED shines a bright cool light and allowing for visibility in the darkness letting you know where you dog is allowing you to feel better relaxed BE ALERT when you are walking your dog you will be able to keep your dog safe as well as let you see in the dark where you pet is SAFETY Provide safety for your dogs and pets if you let them out to wander around at night time EASY TO USE: simply pushing the control button makes the light ON/FLASH/OFF this allows you full control of the LED Lights EXCELLENT MATERIAL made of high quality nylon that is durable and flexible