LED Dog Collar, Flashing Lights Night Safety Dog Collar Nylon&ndash;Black Rhino Provides a safe and fun way to walk your dog at night with four modes of LED lighting (constant on, strobe, flashing, and off) Made of high transparent TPU fiber optic which enables light to display evenly and brightly 2 batteries pre-installed (CR2016) and ready for use Blue Color and Medium Size (12.5" to 19.5") Package includes: 1 Black Rhino Blue Medium LED dog collar