LED Light Flashing Pet Dog Safety Collar For Night Nylon Adjustable S/M/L/XL Very comfortable to wear and you won't worry about it will hurt your beloved dog Highly reflective with sequential LED lighting Adjustable pet collar, easy and convenient to use Flashing Mode: Quickly Flashing / Slowly Flashing / Lighten up (controlled by a button) Radiation pattern: long light - flash - slow flash