JJ&R ILLUMINATING LED SAFETY DOG COLLAR "SMALL" Life Saving - Vehicles will see your dogs bright collar Comfortable, User-Friendly, Fully Adjustable Batteries last 60-80 hours and an extra set is included. Batteries are standard CR2032 butt Collar is water resistant. This means that it is fine in the rain but not suitable for a dog who is hunting or swimming. Collar has 4 modes controlled with a switch on the collar - Solid Light, Fash Blink, Slow Blink, and Off