Pawow Nylon Durable Adjustable Flashing LED Light up Dog Night Safety Collar, 7 Colors Available Light the dogs up at night, daybreak or fog day, you can see them at long distances Also works well to alert drivers and other walkers, makes walking at night much more safer due to visibility of the lights Come with batteries , and 2 different setting mode: blink, stay on Washable and easy to dry, made of by nylon & stainless steel buckle, wear resistant Length: 64cm, width: 2.5cm, adjustable diameter: 13-18cm