This versatile LED necklace is made of durable silicone/plastic and has nine different light modes to suit all needs. With up to 4 hours of flashing light or 2.5 hours of steady light, you can make sure your dog is visible in the dark. The integrated USB connector makes charging easy and convenient - only 40 minutes needed! Not only is the collar splash-proof, but it's also adjustable, so you can customize the size with a simple clip. Perfect for adventures big and small!Facts about Flash Light Ring Multi-colored:Up to 4 hours of flashing light.Up to 2.5 hours solid light.9 different light modes.Splash resistant construction.Adjustable size.Integrated USB connector for charging.Charges in only 40 minutes.