Found this when trying to pair mine:
I had the same problem - what I thought was the unit number was not - it is actually HS850. Instruction manual is here:
http://www.motorola.com/mdirect/manuals/...Basically, hold down the call button until it lights up (steady -not blinking), open the boom, and search for devices in your phone. When it finds it, the passkey is 0000.
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