The product description 1. Excellent Identification and Security for Your Dog - The nylon dog collar uses premium flat fiber optics to give your dog excellent identification and security up to 500 yards. 2.100% Waterproof and Lightweight - Our lights for dog collar come with soft padding the dog feels comfortable, waterproof, rust resistant, durable and lightweight for rainy days. You’re worth it. Note: But do not immerse in water for a long time, such as swimming. 3. Adjustable and Detachable Buckle - Made of high quality nylon and super shiny fiber, you can easily adjust your pet’s size by loosening the buckle. (Note: Please select the size according to your pet’s neck length) 4.DC Rechargeable, Saving Money and Energy – The Flash Dog Collar recharges with any what other device for daily use via USB cable. No need to worry about changing the battery and no extra cost, easy to use, environmental protection.