The Nite Ize Pet Spotlit Collar Light makes everything from nighttime walks to camping simpler and safer. Designed for all your adventures, the SpotLit is highly weather-resistant and easily clips onto the D-ring of your pet's collar or harness. This durable collar light makes it easy to keep track of multiple pets in the dark. A simple push of a button lets you switch from a constant glow mode to an attention-grabbing flashing mode. Replaceable batteries included.