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Like anything electronic, it won't work if the batter dies.  Before that happens though, both the wearer and you will be notified that the battery is getting low, and you can always check on the battery level at any time using the mobile app.

Geofencing is exactly what it sounds like -- it is a geographic virtual fence around an area.  For example, you might program a 100-yard geofence around the wearer's house.  Whenever they get further away from the house than 100 yards, you will get an alert.  You set up geofences inside of the mobile app, and its easy.  You just point to a place on the map and tell it the diameter of the circle you want around that point.

Our devices use the cellular phone system to communicate with the mobile application that you will run on your mobile phone.  If the device is in an area where there is no cell phone coverage, then it will not be able to alert you to any events.  Of course, you can see the history of the device up to the point where it lost coverage, and you will also get an alert when it loses coverage.