We need to always be ready to respond and send out alerts when you press the button on your Tag. By keeping the App in the background, you can be sure that we can send alerts when it really matters. If you had to manually start and stop the application, then you would always have to remember to restart the app when you potentially need help. The problem with this is we often find that we need help when we least expect it. Running Wearsafe in the background allows us to be prepared even when you are not.
The Wearsafe App has been designed to use as little of your battery as possible with Bluetooth low energy technology and other optimizations, but does need to be running to work.