To enable the controller to find the device when it scans for nearby Bluetooth devices, make sure Bluetooth is enabled on the device and the discoverable setting is enabled. For more information, refer to the documentation provided with your device.
When using a SPDL Radio Bridge, press the Radio button for 2 seconds to make it discoverable. The blue and red LEDs will blink, indicating the radio is ready to be paired with. If you press and hold the radio button for longer than 10 seconds then all stored Bluetooth pairings in the SPDL Radio Bridge are cleared. You will need to recreate any Bluetooth pairings between the SPDL Radio Bridge and your controller(s).