This new compact light from SportDOG provides long range visibility of your dog utilizing LED light technology. We have found it ideal for running on hounds at night, and it's durable enough to withstand the most severe conditions for months. It's easy to switch from constant to flashing mode with a push of a button. Available in blue, red, white green or yellow, the SportDOG Safety Light can be set to either constant ON or FLASHING. The light includes a handy Carabineer 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 3/4" or 1" collar strap. The light provides up to 250 hours of on-time with two CR20320 batteries.