More specifically, the "pair" button that I wired up does a few things:

- Turns on the external LED (if you wired one up).
- Clears out any existing paired devices.
- Resets the entire thing to defaults.
- Looks for something to pair for 30 seconds.
- At the end of those 30 seconds it turns off the Pair LED and goes back to normal mode.

For some devices, you have to initiate pairing with the other device while the LED is on. For some other devices, you can pair only when the LED is off, i.e., when the board is sitting there in normal mode doing nothing special.