The title says it all. No bells and whistles, one button is everything you need.
• does not require special Permissions except access to your device's camera in order to use its flash capability
• simple touch of the screen switches your light on or off
• LED will stay on even if you leave the application to perform other tasks (press the Home button to do so)
(Hint: to turn the light off, just return to the app and tap your screen or use the back button)