Bright and early (or late): Three light modes and all-angle visibility means peace of mind when your dog runs ahead, falls back, or goes off-trail. With up to 20 hours of run time and a low battery warning, you can play all day (or night). Designed for dogs: Dogs will be dogs - they get wet, muddy, and covered in snow. The Beacon is lightweight, durable, waterproof, and designed to perform in the great outdoors. Track the pack: Need to keep track of all your canine companions? Designate a color for each dog so you can locate and identify them in low light and at a distance. Light in a flash: The Beacon Light features the Quick Clip and the Quick Ring, for easy attachment to all Ruffwear collars, apparel, packs, life jackets, and harnesses. Protect nature: The Beacon Light is designed with sustainability in mind. Its high-capacity rechargeable battery and USB charging cable (included) eliminate the need to buy, change, and throw away batteries. 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.