The PageFlip app allows you to reprogram the pedal to emit custom key presses instead of the default ones. For example, you can reprogram the pedal to emit a "Play/Pause", "VolumeUp", "Ctrl+Shift+S", or "F12" keypress. You should only reprogram your pedal if the app with which you use the pedal cannot interpret a standard keypress like "Left/Up/Right/Down Arrow".
You can check the battery level of your pedal through the app. You can customize the time of inactivity after which the pedal goes to sleep and the name of the pedal shown in your Bluetooth settings page.
The features provided by this app only work for Firefly pedals that are version V14 or higher. You can check the version number of your pedal on the label on the bottom of the pedal.