By using the light of the camera, you are emitting the Morse code. You can use the characters, only some symbols and alphanumeric characters. And you can send up to 20 characters at a time. You can specify two preset, and the repetition of one to three times.
Office-une has developed Morse Flasher that falls into the Communication category. The latest update of the app was released on Aug 15, 2016 and this application has been installed by over 1K users. The average score for Morse Flasher is 2.8 on Google Play.
Ads are a part of this application. Get the installer of Morse Flasher 1.1 that is free and take a look at users' reviews on Droid Informer. The app is designed for Android 2.3 and above. The download of the app doesn't contain viruses or any kind of malware.