FlashIn app for iPhone and iPad

Version 1.0
Users can this app to communicate with switchers by triggering a series of screen flashing(up-left rect areas, from black to white), meanwhile, the switcher read the flash signals and identify the current user, then unlock the switch if the user is authorized.

Main Feature:
- Login and Logoff
- Remember user credentials.
- Trigger screen flashing by a single button.

In order to use this app, you must have iOS8(or higher) installed on iPhone4s, iPod Touch(5th generation), iPad(3rd generation) or later iOS devices.

This app will not work on iPhone4, iPhone3GS,iPhone 3G or iPad Touches before the 5th generation.