Flashlight uses the LED flash primary camera. If the flash is not the program will not work.

ATTENTION!!! owners of phones with Android 6.0

The operating system security policies and applications are now created with the support of Android 6.0 does not ask for permission to use phone resources (camera, access to contacts, access to the memory card, etc.) has been changed, and set permissions turned off.
For the application to work correctly you need to go to Applications -> Application Manager -> select the desired application and Permissions tab, to allow to use the necessary resources phone.

Otherwise the program will not work properly or will not work.