The Elfin Flip 4K supports Bluetooth 5.2 and can connect to external audio devices.
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Pairing steps:
1. Put your Bluetooth device into pairing mode
2. Press the Settings button on the remote control to open Quick Settings.
3. Go to Bluetooth.
4. Select Pair accessory
5. Choose your device from the list (headphone icon indicates audio device)
6. Confirm the status shows Connected
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If audio is still playing from the projector:
1. Press the Settings button on the remote control to open Quick Settings, then select All Settings.
2. Go to: Display & Sound > Audio Output.
3. Set Audio Output Device to BT.