Its just a flashlight for iPhone 4. Press the on button to light up the LED. Press the off button to turn it off. Simple, easy, useful, free.... download it now!
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=384285861&mt=8
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=384285861&mt=8