The GREEN Locator Beacon from SportDOG Brand is the easy, affordable way to keep track of dogs at night. This compact and versatile safety and location light can be used for everything from finding hounds during night hunts to providing extra visibility - and peace of mind - during evening strolls with a canine companion. The Locator Beacon can be set to either constant ON or FLASHING. The light includes a handy barabiner clip for attaching to a collar D-ring, backpack strap, belt loop or anywhere else a safety light is desired. Or, simply slide it onto any collar up to 1-inch wide. The Locator Beacon provides up to 250 hours of on-time with two CR2032 batteries.