There are some simple usages to navigate user.
Feature One :
You can turn on or turn off flashlight by the button on the screen,it is a general operations.
Feature Two :
When the state of flashlight is "ON", you can disable(or lock) yourscreen by clicking your smartphone power button; you will discoverthe flashlight is still working in the background procedure.
This Feature Two can not only avoid touching screen viaincautious movements, but also allow the user to walk aroundholding a noise flashlight arbitrarily.