This app does morsecode with the built in flashlight on your device. As an addition, it contains both strobe light and flashlight. If you want to use morse code, just select "Morse" in the tab bar. From there just enter the word into the text box and press the power button. You can adjust the speed and you can put it on repeat if you want. Select "Flashlight" in the tab bar to use the flashlight. You can adjust the brightness of the flashlight by using the slider. Just tap the power button and there shall be light. You can also use the strobe light feature. Just select "Strobe" in the tab bar, select how many flashes per second and then press the power button.