WZYuan USB Rechargeable LED Pet Dog Collar, Improved Dog Visibility Safety, Adjustable Nylon Strap Collar Bright Flashing LED Dog Safety Collar LED light glows and flashes in darkness. Helps to keep your dog and other pets safe during walking. Easy to use, simply pushing the control button makes the light steady mode / rapid flashing / slow flashing / off. USB rechargeable battery (cable included) gives about 3 hours of illumination per 1 hour charge. Collar is water resistant. This means that it is fine in the rain but not suitable for a dog who is hunting or swimming. Size: X-Small (28 - 39cm / 11" * 15.35" , Width: 2.0cm)