Flashing Yellow Nylon LED Safety Dog Collar - Adjustable Length LED Light up Collar with 3 Light Settings- S, M, L, or XL LED Dog Collar is made in Nylon LED Safety Collar has 3 LIGHT settings: Continuous lighting, Quickly flashing, Slowly flashing. The speeds is controlled by a button on the collar. LED Dog Collar is adjustable in length. LED Dog Collar is a great way to walk safely at night. Allows for great visibility from a distance. Yellow Dog collar is visible from far away, even in the day time.