If you meet overlay since android version 6.0 or above, restart app. its overlay setting sometimes pops up as OS 6.0 security
If you use android version over 6.0, you should allow Camera permission on. Otherwise it will not work.
very simple flash light application.
it is very useful when you turn the light on or off.
It does not support devices which is not with light.
it would only support phone but tablet.
Tags: led on off , simple flash light replacement , superpower 50 apps