If you are using a Nonin WristOx2 Model 3150, please see “Pairing a Nonin Recorder” below.
If you paired a SleepImage Recorder in Bluetooth settings on the phone settings, unpair it first. Then, try the pairing process in the SleepImage App again.
Make sure Bluetooth is enabled, and that you have granted the necessary permissions to the SleepImage App. On iOS, go to Settings->SleepImage and enable the Bluetooth permission. On Android, go to Settings->Apps->Permissions->Location and select “Allow while using the app”. Android phones will also need to have Location turned on under Settings->Location.
Make sure your phone/tablets’ operating system is up-to-date.
After pressing the button with the magnifying glass icon, with the recorder powered on, wait at least 60 seconds. Some phones take longer to discover and pair with bluetooth accessories.
Restart both the phone/tablet and the recorder.
If there is another phone/tablet available, try that one to rule out that there is an issue with the recorder.