Light Up Blue Dog Collar size Small. Blue light up dog collar for safety during night walks. It still has the little plastic piece that protects the battery still in place. It was never used. I just pulled it out of the packaging to show where the button to turn the light on and off is. I didn't want to remove the protective plastic for the battery because I don't know exactly how long the battery lasts until it needs to be replaced, and i wanted to keep it in new condition. Collar measurements are in the photos. It's for neck sizes 9-14 inches. If you have any questions please feel free to ask me ❤️ #dogcollar #lightupcollar #bluecollar #bluedogcollar #Smallcollar