Sending my black shitzu out on a dark night from my country home can cause some stress. Not knowing where the little mutt has gone has me worrying if he has wandered off too far. Plus out in the country there are many predators that would consider the little dog as a snack. I found this pet blinker in a local feed store. It is the greatest thing I bought for my pet. The bright LEDs can be seen for a good distance and the low battery usage means a long time between changes. The blinker is very light and does not weigh down my little dog. All I have to do now at night is just follow the blinking light to know the location of my dog.