Kedera LED Dog Collars - Custom Personalized ID Collars with Pet Name and Phone Number. Adjustable Sizes with Plastic Snap Closure Our tough nylon LED dog collar comes with your dog's name and phone number permanently stitched into the collar. Battery: cr2032 button battery two normally 50-60 hours or so can be replaced. Product Features: LED light lettering collars, pet personality this latest product. Walk the dog at night, especially for darker hair color of the dog should be very troubling thing is difficult to see the dog's location, it is easy to let the dog wandered off, but the light-emitting collars can solve this problem. In the darkness of the night to bring a dog collar glowing above the neck, the dog can clearly see wherever the location of the dog, let the dog not only safe, but also increased the dog fun.