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, lightweight, and watertight. 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. Runs up to 20 hours on a single charge.