When your pet goes beyond the 'Virtual Fence', you will instantly get an alert on your smartphone.
Another great feature is that you can manage your pet's medical information and vet appointments...How cool is that!
You can also turn on a light or an audible beep on the collar.
Another great feature is being able to view a history of what places your pet has visited which makes them easier to find, should they stray.
Oh..and it's waterproof if your pet enjoys the occasional dip!