Please refer to our quick start guide to make sure the Doppler is ready to be paired. The Quick start guide can be found here: https://manual.sandmandoppler.com/splash/?doc=/sandman-doppler-quick-start/
If you are stuck trying to enter the pairing code into the Doppler, please be sure that you are entering a 6-digit code. The first four digits are displayed as the larger numbers on the display, while the last two digits are displayed as smaller numbers on the bottom right corner of the display.
If you're still having issues with the 6 digit code please try the following steps:
Go to the Bluetooth settings of your phone and make sure Bluetooth is on. Also, in the Bluetooth settings if the Doppler is there please "forget" the device.
If this doesn't work, press the 
button to leave setup mode. Then you'll want to perform a factory reset on the Doppler and try again:
Hold 
and 
until display shows "00:00". Press 
to cancel or 
to confirm.
Lastly, if you're still having issues please us an email at support@paloaltoinnovation.com