Works really well. It's within so many meters within Canada as long as there is cell phone range. If you leave the country you need to call so they can send you another SIM card to change out so it will work when you leave for safety. And the cradle base I found was more accurate for charging with the nugget shaped tracker than the button shaped charger. Ilove the fact I can listen and speak to my child during elopment, or I can decide if it's elopement or just a slip of the satellites. Wish the charge on it lasted longer but it's one of the most accurate l've seen out there.

It helps alert you when a resident is either close to an exit or attempting to go thru an exit door which helps you know where your residents are and that they are safe