Bluetooth
The Pyra's Bluetooth and WiFi systems are both provided by a [Texas Instruments WL1837MOD]
This supports Bluetooth 4.0 and [[ https://en.wikipedia.org/wiki/Bluetooth_low_energy BLE]].
Software support should be available for (at least) file transfer and A2DP audio. This means all standard Bluetooth headphones and speakers will (probably) work.