A GPS tracker can beam location data straight to your phone, letting you know at a glance if your child is where they're supposed to be or how to find them if you've lost sight of them in a crowd.
Once on your phone, spyware can track all your activity and steal ... on your device – your gallery, calls, texts, GPS location, what apps you use, and even deleted searches.
Each of them requires a mobile app to track your progress ... The Charge 6 has a built-in GPS so you can track outdoor workouts without your phone, plus a blood oxygen sensor.