The Ruffwear Beacon is a bright LED dog light designed to keep dogs visible in low-light conditions. This dog-tested light is sturdy, compact, watertight, lightweight, and easy to use. The Beacon clips onto all Ruffwear wearable dog gear - collars, packs, apparel, life jackets, and harnesses. For additional safety, it also clips to runners, hikers, cyclists, kids, and equipment. Imported. High-intensity LED with light dispersing lens provides a hemisphere of light Three light modes allow multiple dog tracking: slow flash, fast flash, and always on Integrated clip and Quick Ring provide two attachment options Watertight Two CR2032 coin cell batteries included