The Small Pet Beacon, little brother to our Guardian series is rugged and waterproof to 30 feet or 10 meters, and will strobe on the supplied battery pack(Cr1220 x 2) for up to 75 hours. Available in five colors, Red, Blue, Green, White and a new "safety" Orange. This model was designed for smaller breed dogs and also for use by cats. Easy mounting to most any collar with the supplied Velcro strap. It is visible at over 1500 feet or one half kilometer(500m). Keep you and your pet safe while out for walks or just to help locate them quickly in your own yard.