【Night Security】: The lightweight collar is super bright for night hikes and makes your dog clearly visible and glows in the dark. find in the dark, highly visible to other walkers, joggers, cyclists, motorists, etc. 【Perfect for any dog】: The length of our necklace is 40 cm. Generous length to adapt to any size. many dog sizes, it can be adjustable to any size. any length to fit; your pet. 【3 light mode settings】easy adjustment by pressing the button and change the lighting modes freely: fast flashing, slow flashing or constant lighting. 【USB charging】: This LED collar for dogs is delivered with smart USB rechargeable technology and lithium-ion battery, providing long battery life. The USB rechargeable battery provides 5 hours of illumination per hour of charge.