This light-up dog collar is rechargeable, easy to adjust, and so bright that you have to see it to believe it. Features a convenient belt-buckle style closure and end-to-end illumination that is highly visible and water resistant. Micro USB cable not included. S: 12″- 16″ or 30.5cm – 40.6cm Two ultra-bright LEDs send light through an integrated optical fiber to create full-length illumination so bright you need to see it to believe it. Featuring the convenience of rechargeability and easy push-button operation, this leash glows for more than six hours.