The LED collar light is a unique battery-powered LED that you can clip securely to your pet's collar keeping him or her stylish and visible at all hours of the day and night. 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-and all other early morning or late evening romps.? - Exquisite dog collar pendant which is visible in the dark - Flickering blue lights - The LED's flash when swaying the pendant light - 3 x LR41 batteries included