The TK-Talkie App allows you to control your BLE-enabled TK-Talkie and allows you to easily customize your setup.
You can even create multiple settings profiles and easily switch between them, allowing you to use your TK-Talkie for a variety of costumes.
There are currently TWO versions of the app:
Version 1.x is for TK-Talkie versions 1 through 3.
Version 2.x is for TK-Talkie version 4.