Durable & Adjustable: 100% heavy duty nylon webbing material with high strength stitching for maximum strength and dog safety. Easy to put on with a quick release buckle. And the led dog collar can be adjusted to fit any size. Dual Fiber LED Designed: Super bright fiber optic provides the best visibility and is built to last so your dog is seen in darkness well in advance, providing protection from vehicles and other unexpected hazards during night walking. USB RECHARGEABLE: This equipment with a rechargeable line, it can be used continuously for more than 10 hours with a single charge, a charge that will last several rides. No worries about replacing batteries and no extra cost. Safety, Eco-Friendly and Waterproof: Dog collar designed with IPX7 waterproof function, no need to worry about your dog when swimming or playing under the water. ‘water ! Please close the soft charging cover after charging and keep away from sea water. 100% GUARANTEE - 100% Money Back Guarantee - 24/7