The Nite Ize PetLit LED Collar Light in lime green is a unique battery-powered LED that you can clip securely to your pet's collar, keeping her stylish and visible at all hours - day or night. Made of durable plastic with a playful design or jewel crystal decoration, the bright LED light is easy to activate with a simple twist. It's a fun, yet reliable way to keep your furry friend safe and visible when you're out hiking, camping, running, walking, or playing in the park.