When you let your dog off its leash, do you get a little twinge of concern that he might run off or amble away and get lost? But it won't be a concern if you put Yiwen GX11 pet gps tracker on your pets. 

The Yiwen GPS tracking system includes a pet module with a collar attachment, a guardian module you can carry or keep in your pocket. The Yiwen GX11 with a SIM card built in, so that the pet GPS tracker with GSM/WIFI/LBS signal all the time and no matter how far away from your pet.

To prevent your dog from going outside too far, you can set up a customized "fence" around your dog's position. If you set up a virtual fence of 100 yards and your pet goes "outside the fence" you'll be alerted immediately and can maintain contact by heading in your dog's direction.

There's also a virtual leash feature you can use by setting your own position as the center point. If your dog wanders (or runs like crazy) outside that range, you'll be alerted so you can call (or run after) your wayward pet.