Whistle 3 has a bunch of new features that go beyond the design:
The other improvements are under the hood. Without getting too technical, it's safe to say the new device is much faster. When your pet goes outside of a "safe zone", you get alerted much quicker.
Speaking of "safe zones", you can now have multiple zones, which makes tracking them very easy when they're at different locations.
WiFi and Bluetooth can now be used (power save mode and battery life extension), and the free app is brand new. The new app uses Google Maps for faster locating which is more precise.
Whistle 3 is now an all-in-one collar, which means it contains the GPS technology to track locations, and also the ability to monitor activity. No separate collar is needed!
How Do the Subscription Plans Work?
The new collar comes with a 90 day money back guarantee which is great if you're trying these out for the first time.
To get started you will need to purchase the collar itself, and then a subscription plan. The plans cost between $6.95 to $9.95 per month depending on what plan you get.
Remember, these plans are in place because of the on-demand location tracking that Whistle uses through the largest cellular network in the US. Think of the collar as a little cell phone that transmits data across the network. This is why a subscription plan is needed.