Pesp LED Lights for Dogs Puppy Cats Doggie Pets Dog Luminous Pendant LED Night Safety Lights The Item have three modes: 1.Steady on 2.fast flash 3.normal flash, each one have more than 60 hours working time and is easily replaceable batteries. Clip the lightweight, durable Spotlight Collar Light to any dog collar and you'll be able to easily see him or her in the darkest night. The battery-powered LED emits a bright ambient glow, perfect for those pre-dawn or after-dark outings. Made of durable plastic, lights clip securely to pet collar emits a bright, ambient glow. Weather-resistant approx 100 hours, normal 3-4 months of use, battery can be replaced.