One click to turn it on ; another one to turn it off.
A long click enables the light to blink.
If your mobile does not have a flash, the screen will be used instead.
This app requests the access to the Camera to turn on/off the flash LED.
No data is recorded by the camera, nor sent to someone else.
That's why only the Camera permission is asked.
If this permission is denied, the screen will be used intead in maximum brightness.