This Blue Flashing Dog Collar Tag offers all round visibility when your four legged friend is out walking. This product flashes on both sides to alert passing drivers / fellow dog walkers or pedestrians to your pet’s presence and is effective up to 300m. It is a useful product for keeping an eye on your pet and a great safety feature! Simply add onto your pet’s collar. Splash proof, it comes with 2 batteries included. Diameter 3.5cm