This led flashing dog leads is use rechargeable micro USB: The Led Leash For Dog can be recharged by Micro USB cable with daily use device. And it is very Eco-friendly. Ultra led flashing light and durable POM buckle is be seen be safe, and strong control the large dog. There are matching Nylon LED Dog Collar use super bright led light 850 viewing distance over 1000 feet, led dog collar can improve the safety and visibility of dogs more effectively at night.