Tap in the navigation bar, and the camera view displays.
In the camera view mode, scan the device's barcode. Before scanning, ensure that the RFD40+ Bluetooth indicator LED blinks, indicating the device is discoverable. Otherwise, the device will not display in the picker list.
Select the device you want to pair and press the RFD40+ trigger to pair when the Bluetooth LED starts flashing fast. You will hear a beep when the device is successfully paired.