How do I pair two SPIRIT units for Bluetooth intercom use?
Both units should be in pairing mode: On one unit, press and hold button for 5 seconds until the LED flashes red. Repeat on other unit within 2 minutes. Once paired successfully through Cardo's protocol or another Bluetooth intercom group method, they will automatically recognize each other when nearby. (Page 14)
From the official Cardo Systems Spirit HD manual, page 14
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