How can I use RG650’s user defined (yellow) button?

It needs to be activated in a certain app called “CustomKey”, which is pre-installed on RG650.

After you turn on the device, first you need to open the app. Inside you can define the left yellow button for turning on the camera, Bluetooth on/off, Push-to-talk or opening your favourite apps, etc.

If you don’t define it, nothing will happen when you press the button.