Press and hold the Zulu 3 Bluetooth button for about five to ten seconds or until the Bluetooth LED continually flashes RED and BLUE. This indicates the Zulu 3 pairing mode setting and lasts about two minutes.
Turn on the headset and verify the green LED is flashing. ... Press and hold the Zulu 3 Bluetooth button for about five to ten seconds or until the Bluetooth LED continually flashes red and blue.
The construction is probably the biggest difference, and you can see that right away. While the Zulu 3 has almost no plastic in it, the Sierra is made from a fiber reinforced polymer. This is partly why the cost of the Sierra is less. The ANR of the Sierra, while very good, is not quite as good as the ANR of a Zulu 3.
