Max & Molly lights are 100% waterproof, USB charged (cord included) pet safety light, truly unique in the market. Each ultra bright light fits securely on any size collar/leash/harness with its nonslip colored silicone strap. No slipping on the pet's collar, no more batteries. Pushbutton sets light for steady on or blinking. This product is awesome for any outdoor lifestyle - great for beach, boating, hiking, runners, etc.